155415432520 has 16 divisors (see below), whose sum is σ = 349684723260. Its totient is φ = 62166172992.

The previous prime is 155415432499. The next prime is 155415432521. The reversal of 155415432520 is 25234514551.

155415432520 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 152769976164 + 2645456356 = 390858^2 + 51434^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 155415432520.

It is not an unprimeable number, because it can be changed into a prime (155415432521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1942692867 + ... + 1942692946.

Almost surely, 2^155415432520 is an apocalyptic number.

155415432520 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

155415432520 is an abundant number, since it is smaller than the sum of its proper divisors (194269290740).

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

155415432520 is a wasteful number, since it uses less digits than its factorization.

155415432520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3885385824 (or 3885385820 counting only the distinct ones).

The product of its (nonzero) digits is 120000, while the sum is 37.

The spelling of 155415432520 in words is "one hundred fifty-five billion, four hundred fifteen million, four hundred thirty-two thousand, five hundred twenty".