691596379128 has 16 divisors (see below), whose sum is σ = 1728990947880. Its totient is φ = 230532126368.

The previous prime is 691596379069. The next prime is 691596379153. The reversal of 691596379128 is 821973695196.

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, 14408257875 + ... + 14408257922.

Almost surely, 2^691596379128 is an apocalyptic number.

It is an amenable number.

691596379128 is an abundant number, since it is smaller than the sum of its proper divisors (1037394568752).

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

691596379128 is a wasteful number, since it uses less digits than its factorization.

691596379128 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28816515806 (or 28816515802 counting only the distinct ones).

The product of its digits is 44089920, while the sum is 66.

The spelling of 691596379128 in words is "six hundred ninety-one billion, five hundred ninety-six million, three hundred seventy-nine thousand, one hundred twenty-eight".