91563949718 has 8 divisors (see below), whose sum is σ = 137360258760. Its totient is φ = 45777196800.

The previous prime is 91563949703. The next prime is 91563949727. The reversal of 91563949718 is 81794936519.

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, 2365028 + ... + 2403431.

It is an arithmetic number, because the mean of its divisors is an integer number (17170032345).

Almost surely, 2^91563949718 is an apocalyptic number.

91563949718 is a deficient number, since it is larger than the sum of its proper divisors (45796309042).

91563949718 is a wasteful number, since it uses less digits than its factorization.

91563949718 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4778062.

The product of its digits is 14696640, while the sum is 62.

The spelling of 91563949718 in words is "ninety-one billion, five hundred sixty-three million, nine hundred forty-nine thousand, seven hundred eighteen".