91537880406 has 16 divisors (see below), whose sum is σ = 209229441024. Its totient is φ = 26153680104.

The previous prime is 91537880377. The next prime is 91537880429. The reversal of 91537880406 is 60408873519.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1089736630 + ... + 1089736713.

It is an arithmetic number, because the mean of its divisors is an integer number (13076840064).

Almost surely, 2^91537880406 is an apocalyptic number.

91537880406 is an abundant number, since it is smaller than the sum of its proper divisors (117691560618).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

91537880406 is a wasteful number, since it uses less digits than its factorization.

91537880406 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2179473355.

The product of its (nonzero) digits is 1451520, while the sum is 51.

The spelling of 91537880406 in words is "ninety-one billion, five hundred thirty-seven million, eight hundred eighty thousand, four hundred six".