91406565766 has 8 divisors (see below), whose sum is σ = 137631179664. Its totient is φ = 45529505880.

The previous prime is 91406565763. The next prime is 91406565773. The reversal of 91406565766 is 66756560419.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91406565763) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 86887845 + ... + 86888896.

It is an arithmetic number, because the mean of its divisors is an integer number (17203897458).

Almost surely, 2^91406565766 is an apocalyptic number.

91406565766 is a deficient number, since it is larger than the sum of its proper divisors (46224613898).

91406565766 is a wasteful number, since it uses less digits than its factorization.

91406565766 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 173777006.

The product of its (nonzero) digits is 8164800, while the sum is 55.

The spelling of 91406565766 in words is "ninety-one billion, four hundred six million, five hundred sixty-five thousand, seven hundred sixty-six".