691396408054 has 16 divisors (see below), whose sum is σ = 1131410319120. Its totient is φ = 314261544960.

The previous prime is 691396408049. The next prime is 691396408061. The reversal of 691396408054 is 450804693196.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 691396407986 and 691396408004.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 290422 + ... + 1211254.

It is an arithmetic number, because the mean of its divisors is an integer number (70713144945).

Almost surely, 2^691396408054 is an apocalyptic number.

691396408054 is a deficient number, since it is larger than the sum of its proper divisors (440013911066).

691396408054 is a wasteful number, since it uses less digits than its factorization.

691396408054 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 954975.

The product of its (nonzero) digits is 5598720, while the sum is 55.

The spelling of 691396408054 in words is "six hundred ninety-one billion, three hundred ninety-six million, four hundred eight thousand, fifty-four".