691489997159 has 16 divisors (see below), whose sum is σ = 751479593760. Its totient is φ = 632489195520.

The previous prime is 691489997131. The next prime is 691489997189. The reversal of 691489997159 is 951799984196.

It is not a de Polignac number, because 691489997159 - 2¹² = 691489993063 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 691489997159.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (691489997189) 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, 574199 + ... + 1308695.

It is an arithmetic number, because the mean of its divisors is an integer number (46967474610).

Almost surely, 2^691489997159 is an apocalyptic number.

691489997159 is a deficient number, since it is larger than the sum of its proper divisors (59989596601).

691489997159 is a wasteful number, since it uses less digits than its factorization.

691489997159 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 735170.

The product of its digits is 396809280, while the sum is 77.

The spelling of 691489997159 in words is "six hundred ninety-one billion, four hundred eighty-nine million, nine hundred ninety-seven thousand, one hundred fifty-nine".