663436612155 has 16 divisors (see below), whose sum is σ = 1061511333120. Its totient is φ = 353828608608.

The previous prime is 663436612127. The next prime is 663436612177. The reversal of 663436612155 is 551216634366.

It is not a de Polignac number, because 663436612155 - 2¹⁷ = 663436481083 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, 1335744 + ... + 1763826.

It is an arithmetic number, because the mean of its divisors is an integer number (66344458320).

Almost surely, 2^663436612155 is an apocalyptic number.

663436612155 is a deficient number, since it is larger than the sum of its proper divisors (398074720965).

663436612155 is a wasteful number, since it uses less digits than its factorization.

663436612155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 531410.

The product of its digits is 2332800, while the sum is 48.

The spelling of 663436612155 in words is "six hundred sixty-three billion, four hundred thirty-six million, six hundred twelve thousand, one hundred fifty-five".