691627639959 has 10 divisors (see below), whose sum is σ = 1033172153640. Its totient is φ = 461085093252.

The previous prime is 691627639939. The next prime is 691627640069. The reversal of 691627639959 is 959936726196.

691627639959 is a `hidden beast` number, since 6 + 9 + 162 + 76 + 399 + 5 + 9 = 666.

It is not a de Polignac number, because 691627639959 - 2²⁴ = 691610862743 is a prime.

It is a super-2 number, since 2×691627639959² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (691627639939) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 4269306339 + ... + 4269306500.

It is an arithmetic number, because the mean of its divisors is an integer number (103317215364).

Almost surely, 2^691627639959 is an apocalyptic number.

691627639959 is a deficient number, since it is larger than the sum of its proper divisors (341544513681).

691627639959 is an equidigital number, since it uses as much as digits as its factorization.

691627639959 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8538612851 (or 8538612842 counting only the distinct ones).

The product of its digits is 297606960, while the sum is 72.

The spelling of 691627639959 in words is "six hundred ninety-one billion, six hundred twenty-seven million, six hundred thirty-nine thousand, nine hundred fifty-nine".