634431556561404 has 24 divisors (see below), whose sum is σ = 1691817484163968. Its totient is φ = 181266159017520.

The previous prime is 634431556561399. The next prime is 634431556561457. The reversal of 634431556561404 is 404165655134436.

It is a super-3 number, since 3×634431556561404³ (a number of 45 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3776378312782 + ... + 3776378312949.

Almost surely, 2^{634431556561404} is an apocalyptic number.

It is an amenable number.

634431556561404 is an abundant number, since it is smaller than the sum of its proper divisors (1057385927602564).

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

634431556561404 is a wasteful number, since it uses less digits than its factorization.

634431556561404 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7552756625745 (or 7552756625743 counting only the distinct ones).

The product of its (nonzero) digits is 62208000, while the sum is 57.

The spelling of 634431556561404 in words is "six hundred thirty-four trillion, four hundred thirty-one billion, five hundred fifty-six million, five hundred sixty-one thousand, four hundred four".