21600766162555 has 16 divisors (see below), whose sum is σ = 26079503063040. Its totient is φ = 17174917220832.

The previous prime is 21600766162519. The next prime is 21600766162567. The reversal of 21600766162555 is 55526166700612.

It is a cyclic number.

It is not a de Polignac number, because 21600766162555 - 2⁷ = 21600766162427 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4811722 + ... + 8145808.

It is an arithmetic number, because the mean of its divisors is an integer number (1629968941440).

Almost surely, 2^{21600766162555} is an apocalyptic number.

21600766162555 is a deficient number, since it is larger than the sum of its proper divisors (4478736900485).

21600766162555 is a wasteful number, since it uses less digits than its factorization.

21600766162555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3342018.

The product of its (nonzero) digits is 4536000, while the sum is 52.

The spelling of 21600766162555 in words is "twenty-one trillion, six hundred billion, seven hundred sixty-six million, one hundred sixty-two thousand, five hundred fifty-five".