155121031712640 has 256 divisors, whose sum is σ = 567617777233920. Its totient is φ = 35297238564864.

The previous prime is 155121031712617. The next prime is 155121031712663. The reversal of 155121031712640 is 46217130121551.

155121031712640 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (155121031712617) and next prime (155121031712663).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 22881229 + ... + 28875468.

It is an arithmetic number, because the mean of its divisors is an integer number (2217256942320).

Almost surely, 2^{155121031712640} is an apocalyptic number.

155121031712640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

155121031712640 is an abundant number, since it is smaller than the sum of its proper divisors (412496745521280).

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

155121031712640 is a wasteful number, since it uses less digits than its factorization.

155121031712640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51756949 (or 51756937 counting only the distinct ones).

The product of its (nonzero) digits is 50400, while the sum is 39.

The spelling of 155121031712640 in words is "one hundred fifty-five trillion, one hundred twenty-one billion, thirty-one million, seven hundred twelve thousand, six hundred forty".