165920266050 has 384 divisors, whose sum is σ = 549792811008. Its totient is φ = 32054784000.

The previous prime is 165920266049. The next prime is 165920266051. The reversal of 165920266050 is 50662029561.

It is an interprime number because it is at equal distance from previous prime (165920266049) and next prime (165920266051).

It is a super-2 number, since 2×165920266050² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a junction number, because it is equal to n+sod(n) for n = 165920265993 and 165920266011.

It is not an unprimeable number, because it can be changed into a prime (165920266051) by changing a digit.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 16291960 + ... + 16302140.

It is an arithmetic number, because the mean of its divisors is an integer number (1431752112).

Almost surely, 2^165920266050 is an apocalyptic number.

165920266050 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 165920266050, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (274896405504).

165920266050 is an abundant number, since it is smaller than the sum of its proper divisors (383872544958).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

165920266050 is a wasteful number, since it uses less digits than its factorization.

165920266050 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10314 (or 10309 counting only the distinct ones).

The product of its (nonzero) digits is 194400, while the sum is 42.

The spelling of 165920266050 in words is "one hundred sixty-five billion, nine hundred twenty million, two hundred sixty-six thousand, fifty".