121535931328665 has 32 divisors (see below), whose sum is σ = 222237570537216. Its totient is φ = 55559173152000.

The previous prime is 121535931328657. The next prime is 121535931328709. The reversal of 121535931328665 is 566823139535121.

It is not a de Polignac number, because 121535931328665 - 2³ = 121535931328657 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 121535931328599 and 121535931328608.

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, 78696415 + ... + 80225915.

It is an arithmetic number, because the mean of its divisors is an integer number (6944924079288).

Almost surely, 2^{121535931328665} is an apocalyptic number.

121535931328665 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

121535931328665 is a deficient number, since it is larger than the sum of its proper divisors (100701639208551).

121535931328665 is a wasteful number, since it uses less digits than its factorization.

121535931328665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2286289.

The product of its digits is 34992000, while the sum is 60.

The spelling of 121535931328665 in words is "one hundred twenty-one trillion, five hundred thirty-five billion, nine hundred thirty-one million, three hundred twenty-eight thousand, six hundred sixty-five".