91697781946 has 32 divisors (see below), whose sum is σ = 144622632960. Its totient is φ = 43547641200.

The previous prime is 91697781871. The next prime is 91697781971. The reversal of 91697781946 is 64918779619.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2288335 + ... + 2328061.

It is an arithmetic number, because the mean of its divisors is an integer number (4519457280).

Almost surely, 2^91697781946 is an apocalyptic number.

91697781946 is a deficient number, since it is larger than the sum of its proper divisors (52924851014).

91697781946 is a wasteful number, since it uses less digits than its factorization.

91697781946 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40450.

The product of its digits is 41150592, while the sum is 67.

The spelling of 91697781946 in words is "ninety-one billion, six hundred ninety-seven million, seven hundred eighty-one thousand, nine hundred forty-six".