691494477020 has 12 divisors (see below), whose sum is σ = 1452138401784. Its totient is φ = 276597790800.

The previous prime is 691494476989. The next prime is 691494477061. The reversal of 691494477020 is 20774494196.

It is a super-2 number, since 2×691494477020² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17287361906 + ... + 17287361945.

It is an arithmetic number, because the mean of its divisors is an integer number (121011533482).

Almost surely, 2^691494477020 is an apocalyptic number.

It is an amenable number.

691494477020 is an abundant number, since it is smaller than the sum of its proper divisors (760643924764).

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

691494477020 is a wasteful number, since it uses less digits than its factorization.

691494477020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34574723860 (or 34574723858 counting only the distinct ones).

The product of its (nonzero) digits is 3048192, while the sum is 53.

The spelling of 691494477020 in words is "six hundred ninety-one billion, four hundred ninety-four million, four hundred seventy-seven thousand, twenty".