91508425678 has 24 divisors (see below), whose sum is σ = 141555422232. Its totient is φ = 44365286304.

The previous prime is 91508425643. The next prime is 91508425703. The reversal of 91508425678 is 87652480519.

It is a happy number.

It is a Smith number, since the sum of its digits (55) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 745201 + ... + 859267.

It is an arithmetic number, because the mean of its divisors is an integer number (5898142593).

Almost surely, 2^91508425678 is an apocalyptic number.

91508425678 is a deficient number, since it is larger than the sum of its proper divisors (50046996554).

91508425678 is a wasteful number, since it uses less digits than its factorization.

91508425678 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 114436 (or 114399 counting only the distinct ones).

The product of its (nonzero) digits is 4838400, while the sum is 55.

The spelling of 91508425678 in words is "ninety-one billion, five hundred eight million, four hundred twenty-five thousand, six hundred seventy-eight".