634811485680 has 60 divisors (see below), whose sum is σ = 2131908575160. Its totient is φ = 169283062656.

The previous prime is 634811485597. The next prime is 634811485681. The reversal of 634811485680 is 86584118436.

634811485680 is a `hidden beast` number, since 6 + 3 + 4 + 81 + 1 + 485 + 6 + 80 = 666.

It is a tau number, because it is divible by the number of its divisors (60).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (634811485681) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 440840590 + ... + 440842029.

It is an arithmetic number, because the mean of its divisors is an integer number (35531809586).

Almost surely, 2^634811485680 is an apocalyptic number.

634811485680 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

634811485680 is an abundant number, since it is smaller than the sum of its proper divisors (1497097089480).

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

634811485680 is a wasteful number, since it uses less digits than its factorization.

634811485680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 881682638 (or 881682629 counting only the distinct ones).

The product of its (nonzero) digits is 4423680, while the sum is 54.

The spelling of 634811485680 in words is "six hundred thirty-four billion, eight hundred eleven million, four hundred eighty-five thousand, six hundred eighty".