165151501556 has 24 divisors (see below), whose sum is σ = 299056733640. Its totient is φ = 79708160000.

The previous prime is 165151501547. The next prime is 165151501579. The reversal of 165151501556 is 655105151561.

It can be written as a sum of positive squares in 4 ways, for example, as 33043968400 + 132107533156 = 181780^2 + 363466^2 .

It is a super-2 number, since 2×165151501556² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 286196 + ... + 642036.

It is an arithmetic number, because the mean of its divisors is an integer number (12460697235).

Almost surely, 2^165151501556 is an apocalyptic number.

It is an amenable number.

165151501556 is a deficient number, since it is larger than the sum of its proper divisors (133905232084).

165151501556 is a wasteful number, since it uses less digits than its factorization.

165151501556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 359875 (or 359873 counting only the distinct ones).

The product of its (nonzero) digits is 112500, while the sum is 41.

The spelling of 165151501556 in words is "one hundred sixty-five billion, one hundred fifty-one million, five hundred one thousand, five hundred fifty-six".