91920610088957 has 16 divisors (see below), whose sum is σ = 99041330344320. Its totient is φ = 84807021816000.

The previous prime is 91920610088939. The next prime is 91920610088969. The reversal of 91920610088957 is 75988001602919.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 91920610088957 - 2¹² = 91920610084861 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 91920610088893 and 91920610088902.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91920610088557) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1465983707 + ... + 1466046407.

It is an arithmetic number, because the mean of its divisors is an integer number (6190083146520).

Almost surely, 2^{91920610088957} is an apocalyptic number.

It is an amenable number.

91920610088957 is a deficient number, since it is larger than the sum of its proper divisors (7120720255363).

91920610088957 is a wasteful number, since it uses less digits than its factorization.

91920610088957 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 117764.

The product of its (nonzero) digits is 19595520, while the sum is 65.

The spelling of 91920610088957 in words is "ninety-one trillion, nine hundred twenty billion, six hundred ten million, eighty-eight thousand, nine hundred fifty-seven".