155121352500 has 60 divisors (see below), whose sum is σ = 452292520064. Its totient is φ = 41365692000.

The previous prime is 155121352499. The next prime is 155121352511. The reversal of 155121352500 is 5253121551.

It is a tau number, because it is divible by the number of its divisors (60).

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 10333924 + ... + 10348923.

Almost surely, 2^155121352500 is an apocalyptic number.

155121352500 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

155121352500 is an abundant number, since it is smaller than the sum of its proper divisors (297171167564).

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

155121352500 is a wasteful number, since it uses less digits than its factorization.

155121352500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20682874 (or 20682857 counting only the distinct ones).

The product of its (nonzero) digits is 7500, while the sum is 30.

The spelling of 155121352500 in words is "one hundred fifty-five billion, one hundred twenty-one million, three hundred fifty-two thousand, five hundred".