155724888138 has 16 divisors (see below), whose sum is σ = 313170495456. Its totient is φ = 51621509520.

The previous prime is 155724888133. The next prime is 155724888139. The reversal of 155724888138 is 831888427551.

It is a happy number.

It is a super-2 number, since 2×155724888138² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (155724888133) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 71695456 + ... + 71697627.

It is an arithmetic number, because the mean of its divisors is an integer number (19573155966).

Almost surely, 2^155724888138 is an apocalyptic number.

155724888138 is an abundant number, since it is smaller than the sum of its proper divisors (157445607318).

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

155724888138 is a wasteful number, since it uses less digits than its factorization.

155724888138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 143393269.

The product of its digits is 17203200, while the sum is 60.

The spelling of 155724888138 in words is "one hundred fifty-five billion, seven hundred twenty-four million, eight hundred eighty-eight thousand, one hundred thirty-eight".