691349875954 has 16 divisors (see below), whose sum is σ = 1108686728448. Its totient is φ = 322182464832.

The previous prime is 691349875949. The next prime is 691349875961. The reversal of 691349875954 is 459578943196.

It is a super-2 number, since 2×691349875954² (a number of 24 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 98704362 + ... + 98711365.

It is an arithmetic number, because the mean of its divisors is an integer number (69292920528).

Almost surely, 2^691349875954 is an apocalyptic number.

691349875954 is a deficient number, since it is larger than the sum of its proper divisors (417336852494).

691349875954 is a wasteful number, since it uses less digits than its factorization.

691349875954 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 197415849.

The product of its digits is 293932800, while the sum is 70.

The spelling of 691349875954 in words is "six hundred ninety-one billion, three hundred forty-nine million, eight hundred seventy-five thousand, nine hundred fifty-four".