691601071080 has 64 divisors (see below), whose sum is σ = 2130878989440. Its totient is φ = 179442438912.

The previous prime is 691601071079. The next prime is 691601071141. The reversal of 691601071080 is 80170106196.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 77878564 + ... + 77887443.

It is an arithmetic number, because the mean of its divisors is an integer number (33294984210).

Almost surely, 2^691601071080 is an apocalyptic number.

691601071080 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

691601071080 is an abundant number, since it is smaller than the sum of its proper divisors (1439277918360).

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

691601071080 is a wasteful number, since it uses less digits than its factorization.

691601071080 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 155766058 (or 155766054 counting only the distinct ones).

The product of its (nonzero) digits is 18144, while the sum is 39.

The spelling of 691601071080 in words is "six hundred ninety-one billion, six hundred one million, seventy-one thousand, eighty".