538115921655 has 32 divisors (see below), whose sum is σ = 938952053760. Its totient is φ = 261565200000.

The previous prime is 538115921653. The next prime is 538115921659. The reversal of 538115921655 is 556129511835.

It is not a de Polignac number, because 538115921655 - 2¹ = 538115921653 is a prime.

It is a super-2 number, since 2×538115921655² (a number of 24 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 538115921598 and 538115921607.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (538115921653) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 17450221 + ... + 17481030.

It is an arithmetic number, because the mean of its divisors is an integer number (29342251680).

Almost surely, 2^538115921655 is an apocalyptic number.

538115921655 is a deficient number, since it is larger than the sum of its proper divisors (400836132105).

538115921655 is a wasteful number, since it uses less digits than its factorization.

538115921655 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34931351.

The product of its digits is 1620000, while the sum is 51.

The spelling of 538115921655 in words is "five hundred thirty-eight billion, one hundred fifteen million, nine hundred twenty-one thousand, six hundred fifty-five".