90171438651 has 64 divisors (see below), whose sum is σ = 154912665600. Its totient is φ = 50771432448.

The previous prime is 90171438547. The next prime is 90171438691. The reversal of 90171438651 is 15683417109.

90171438651 is a `hidden beast` number, since 90 + 1 + 71 + 438 + 65 + 1 = 666.

It is not a de Polignac number, because 90171438651 - 2¹⁸ = 90171176507 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 90171438597 and 90171438606.

It is not an unprimeable number, because it can be changed into a prime (90171438691) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 17892190 + ... + 17897228.

It is an arithmetic number, because the mean of its divisors is an integer number (2420510400).

Almost surely, 2^90171438651 is an apocalyptic number.

90171438651 is a deficient number, since it is larger than the sum of its proper divisors (64741226949).

90171438651 is a wasteful number, since it uses less digits than its factorization.

90171438651 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6425 (or 6419 counting only the distinct ones).

The product of its (nonzero) digits is 181440, while the sum is 45.

The spelling of 90171438651 in words is "ninety billion, one hundred seventy-one million, four hundred thirty-eight thousand, six hundred fifty-one".