531663638694 has 32 divisors (see below), whose sum is σ = 1110859916544. Its totient is φ = 169317176160.

The previous prime is 531663638657. The next prime is 531663638699. The reversal of 531663638694 is 496836366135.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (531663638699) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2140572 + ... + 2375999.

It is an arithmetic number, because the mean of its divisors is an integer number (34714372392).

Almost surely, 2^531663638694 is an apocalyptic number.

531663638694 is an abundant number, since it is smaller than the sum of its proper divisors (579196277850).

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

531663638694 is a wasteful number, since it uses less digits than its factorization.

531663638694 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4517452.

The product of its digits is 50388480, while the sum is 60.

The spelling of 531663638694 in words is "five hundred thirty-one billion, six hundred sixty-three million, six hundred thirty-eight thousand, six hundred ninety-four".