155135352520 has 32 divisors (see below), whose sum is σ = 349263833400. Its totient is φ = 62016933888.

The previous prime is 155135352511. The next prime is 155135352557. The reversal of 155135352520 is 25253531551.

It can be written as a sum of positive squares in 4 ways, for example, as 121191711876 + 33943640644 = 348126^2 + 184238^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 155135352520.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1095129 + ... + 1228648.

Almost surely, 2^155135352520 is an apocalyptic number.

155135352520 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

155135352520 is an abundant number, since it is smaller than the sum of its proper divisors (194128480880).

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

155135352520 is a wasteful number, since it uses less digits than its factorization.

155135352520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2325457 (or 2325453 counting only the distinct ones).

The product of its (nonzero) digits is 112500, while the sum is 37.

The spelling of 155135352520 in words is "one hundred fifty-five billion, one hundred thirty-five million, three hundred fifty-two thousand, five hundred twenty".