165740398785 has 288 divisors, whose sum is σ = 340033494528. Its totient is φ = 74085580800.

The previous prime is 165740398783. The next prime is 165740398793. The reversal of 165740398785 is 587893047561.

165740398785 is a `hidden beast` number, since 1 + 65 + 7 + 403 + 98 + 7 + 85 = 666.

It is not a de Polignac number, because 165740398785 - 2¹ = 165740398783 is a prime.

It is not an unprimeable number, because it can be changed into a prime (165740398783) by changing a digit.

It is a polite number, since it can be written in 287 ways as a sum of consecutive naturals, for example, 1097618460 + ... + 1097618610.

It is an arithmetic number, because the mean of its divisors is an integer number (1180671856).

Almost surely, 2^165740398785 is an apocalyptic number.

165740398785 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

165740398785 is an abundant number, since it is smaller than the sum of its proper divisors (174293095743).

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

165740398785 is a wasteful number, since it uses less digits than its factorization.

165740398785 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 353 (or 321 counting only the distinct ones).

The product of its (nonzero) digits is 50803200, while the sum is 63.

The spelling of 165740398785 in words is "one hundred sixty-five billion, seven hundred forty million, three hundred ninety-eight thousand, seven hundred eighty-five".