691809878274 has 32 divisors (see below), whose sum is σ = 1465129783296. Its totient is φ = 217020522240.

The previous prime is 691809878219. The next prime is 691809878281. The reversal of 691809878274 is 472878908196.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 691809878199 and 691809878208.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 993919 + ... + 1539965.

It is an arithmetic number, because the mean of its divisors is an integer number (45785305728).

Almost surely, 2^691809878274 is an apocalyptic number.

691809878274 is an abundant number, since it is smaller than the sum of its proper divisors (773319905022).

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

691809878274 is a wasteful number, since it uses less digits than its factorization.

691809878274 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 558490.

The product of its (nonzero) digits is 97542144, while the sum is 69.

The spelling of 691809878274 in words is "six hundred ninety-one billion, eight hundred nine million, eight hundred seventy-eight thousand, two hundred seventy-four".