155720155515050 has 36 divisors (see below), whose sum is σ = 336927569142150. Its totient is φ = 53389767604320.

The previous prime is 155720155515019. The next prime is 155720155515079. The reversal of 155720155515050 is 50515551027551.

It can be written as a sum of positive squares in 3 ways, for example, as 85508174125969 + 70211981389081 = 9247063^2 + 8379259^2 .

It is a junction number, because it is equal to n+sod(n) for n = 155720155514986 and 155720155515004.

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 31779621125 + ... + 31779626024.

Almost surely, 2^{155720155515050} is an apocalyptic number.

155720155515050 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

155720155515050 is an abundant number, since it is smaller than the sum of its proper divisors (181207413627100).

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

155720155515050 is a wasteful number, since it uses less digits than its factorization.

155720155515050 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63559247175 (or 63559247163 counting only the distinct ones).

The product of its (nonzero) digits is 1093750, while the sum is 47.

The spelling of 155720155515050 in words is "one hundred fifty-five trillion, seven hundred twenty billion, one hundred fifty-five million, five hundred fifteen thousand, fifty".