165401405757250 has 128 divisors (see below), whose sum is σ = 345061217592000. Its totient is φ = 58945940121600.

The previous prime is 165401405757229. The next prime is 165401405757251. The reversal of 165401405757250 is 52757504104561.

It can be written as a sum of positive squares in 32 ways, for example, as 106850612638449 + 58550793118801 = 10336857^2 + 7651849^2 .

It is not an unprimeable number, because it can be changed into a prime (165401405757251) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 287080464 + ... + 287656036.

Almost surely, 2^{165401405757250} is an apocalyptic number.

165401405757250 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

165401405757250 is an abundant number, since it is smaller than the sum of its proper divisors (179659811834750).

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

165401405757250 is a wasteful number, since it uses less digits than its factorization.

165401405757250 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 578681 (or 578671 counting only the distinct ones).

The product of its (nonzero) digits is 5880000, while the sum is 52.

The spelling of 165401405757250 in words is "one hundred sixty-five trillion, four hundred one billion, four hundred five million, seven hundred fifty-seven thousand, two hundred fifty".