165778970112 has 720 divisors, whose sum is σ = 586834440192. Its totient is φ = 46576373760.

The previous prime is 165778970111. The next prime is 165778970113. The reversal of 165778970112 is 211079877561.

It is an interprime number because it is at equal distance from previous prime (165778970111) and next prime (165778970113).

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165778970111) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 432843073 + ... + 432843455.

Almost surely, 2^165778970112 is an apocalyptic number.

165778970112 is a gapful number since it is divisible by the number (12) 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 165778970112, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (293417220096).

165778970112 is an abundant number, since it is smaller than the sum of its proper divisors (421055470080).

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

165778970112 is an frugal number, since it uses more digits than its factorization.

165778970112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 501 (or 466 counting only the distinct ones).

The product of its (nonzero) digits is 1481760, while the sum is 54.

The spelling of 165778970112 in words is "one hundred sixty-five billion, seven hundred seventy-eight million, nine hundred seventy thousand, one hundred twelve".