91402056022645 has 4 divisors (see below), whose sum is σ = 109682467227180. Its totient is φ = 73121644818112.

The previous prime is 91402056022577. The next prime is 91402056022721. The reversal of 91402056022645 is 54622065020419.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 38491576488964 + 52910479533681 = 6204158^2 + 7273959^2 .

It is a cyclic number.

It is not a de Polignac number, because 91402056022645 - 2⁷ = 91402056022517 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 91402056022595 and 91402056022604.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9140205602260 + ... + 9140205602269.

It is an arithmetic number, because the mean of its divisors is an integer number (27420616806795).

Almost surely, 2^{91402056022645} is an apocalyptic number.

It is an amenable number.

91402056022645 is a deficient number, since it is larger than the sum of its proper divisors (18280411204535).

91402056022645 is a wasteful number, since it uses less digits than its factorization.

91402056022645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18280411204534.

The product of its (nonzero) digits is 1036800, while the sum is 46.

The spelling of 91402056022645 in words is "ninety-one trillion, four hundred two billion, fifty-six million, twenty-two thousand, six hundred forty-five".