691357289877 has 64 divisors (see below), whose sum is σ = 1093948128000. Its totient is φ = 430283280384.

The previous prime is 691357289827. The next prime is 691357289879. The reversal of 691357289877 is 778982753196.

It is not a de Polignac number, because 691357289877 - 2⁶ = 691357289813 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (691357289879) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 11564499 + ... + 11624127.

It is an arithmetic number, because the mean of its divisors is an integer number (17092939500).

Almost surely, 2^691357289877 is an apocalyptic number.

It is an amenable number.

691357289877 is a deficient number, since it is larger than the sum of its proper divisors (402590838123).

691357289877 is a wasteful number, since it uses less digits than its factorization.

691357289877 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 59987 (or 59981 counting only the distinct ones).

The product of its digits is 320060160, while the sum is 72.

The spelling of 691357289877 in words is "six hundred ninety-one billion, three hundred fifty-seven million, two hundred eighty-nine thousand, eight hundred seventy-seven".