91639240694 has 8 divisors (see below), whose sum is σ = 137673307368. Its totient is φ = 45748138240.

The previous prime is 91639240669. The next prime is 91639240717. The reversal of 91639240694 is 49604293619.

It is a sphenic number, since it is the product of 3 distinct primes.

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, 35739452 + ... + 35742015.

It is an arithmetic number, because the mean of its divisors is an integer number (17209163421).

Almost surely, 2^91639240694 is an apocalyptic number.

91639240694 is a deficient number, since it is larger than the sum of its proper divisors (46034066674).

91639240694 is a wasteful number, since it uses less digits than its factorization.

91639240694 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71482110.

The product of its (nonzero) digits is 2519424, while the sum is 53.

The spelling of 91639240694 in words is "ninety-one billion, six hundred thirty-nine million, two hundred forty thousand, six hundred ninety-four".