165746761920 has 168 divisors, whose sum is σ = 591214884624. Its totient is φ = 44199115776.

The previous prime is 165746761897. The next prime is 165746761931. The reversal of 165746761920 is 29167647561.

165746761920 is a `hidden beast` number, since 1 + 6 + 574 + 6 + 7 + 61 + 9 + 2 + 0 = 666.

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

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 987999 + ... + 1143518.

It is an arithmetic number, because the mean of its divisors is an integer number (3519136218).

Almost surely, 2^165746761920 is an apocalyptic number.

165746761920 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

165746761920 is an abundant number, since it is smaller than the sum of its proper divisors (425468122704).

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

165746761920 is an equidigital number, since it uses as much as digits as its factorization.

165746761920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2131549 (or 2131527 counting only the distinct ones).

The product of its (nonzero) digits is 3810240, while the sum is 54.

The spelling of 165746761920 in words is "one hundred sixty-five billion, seven hundred forty-six million, seven hundred sixty-one thousand, nine hundred twenty".