120621555634615 has 32 divisors (see below), whose sum is σ = 165733305831936. Its totient is φ = 82557284261760.

The previous prime is 120621555634589. The next prime is 120621555634633. The reversal of 120621555634615 is 516436555126021.

It is a de Polignac number, because none of the positive numbers 2^k-120621555634615 is a prime.

It is a Duffinian number.

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, 63917364 + ... + 65777446.

It is an arithmetic number, because the mean of its divisors is an integer number (5179165807248).

Almost surely, 2^{120621555634615} is an apocalyptic number.

120621555634615 is a deficient number, since it is larger than the sum of its proper divisors (45111750197321).

120621555634615 is a wasteful number, since it uses less digits than its factorization.

120621555634615 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1863559.

The product of its (nonzero) digits is 6480000, while the sum is 52.

The spelling of 120621555634615 in words is "one hundred twenty trillion, six hundred twenty-one billion, five hundred fifty-five million, six hundred thirty-four thousand, six hundred fifteen".