155721953226 has 32 divisors (see below), whose sum is σ = 355971299328. Its totient is φ = 44487560880.

The previous prime is 155721953221. The next prime is 155721953227. The reversal of 155721953226 is 622359127551.

It is not an unprimeable number, because it can be changed into a prime (155721953221) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 255171 + ... + 613641.

It is an arithmetic number, because the mean of its divisors is an integer number (11124103104).

Almost surely, 2^155721953226 is an apocalyptic number.

155721953226 is an abundant number, since it is smaller than the sum of its proper divisors (200249346102).

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

155721953226 is a wasteful number, since it uses less digits than its factorization.

155721953226 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 368826.

The product of its digits is 1134000, while the sum is 48.

The spelling of 155721953226 in words is "one hundred fifty-five billion, seven hundred twenty-one million, nine hundred fifty-three thousand, two hundred twenty-six".