165802972940 has 384 divisors, whose sum is σ = 421382062080. Its totient is φ = 54156211200.

The previous prime is 165802972931. The next prime is 165802972943. The reversal of 165802972940 is 49279208561.

It is a Harshad number since it is a multiple of its sum of digits (53).

It is not an unprimeable number, because it can be changed into a prime (165802972943) by changing a digit.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 1305535157 + ... + 1305535283.

It is an arithmetic number, because the mean of its divisors is an integer number (1097349120).

Almost surely, 2^165802972940 is an apocalyptic number.

165802972940 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 165802972940, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (210691031040).

165802972940 is an abundant number, since it is smaller than the sum of its proper divisors (255579089140).

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

165802972940 is a wasteful number, since it uses less digits than its factorization.

165802972940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 373 (or 371 counting only the distinct ones).

The product of its (nonzero) digits is 2177280, while the sum is 53.

The spelling of 165802972940 in words is "one hundred sixty-five billion, eight hundred two million, nine hundred seventy-two thousand, nine hundred forty".