90638538551 has 6 divisors (see below), whose sum is σ = 99627484656. Its totient is φ = 82398671300.

The previous prime is 90638538539. The next prime is 90638538553. The reversal of 90638538551 is 15583583609.

It is not a de Polignac number, because 90638538551 - 2²⁶ = 90571429687 is a prime.

It is a super-2 number, since 2×90638538551² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 90638538493 and 90638538502.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90638538553) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 374539295 + ... + 374539536.

It is an arithmetic number, because the mean of its divisors is an integer number (16604580776).

Almost surely, 2^90638538551 is an apocalyptic number.

90638538551 is a deficient number, since it is larger than the sum of its proper divisors (8988946105).

90638538551 is a wasteful number, since it uses less digits than its factorization.

90638538551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 749078853 (or 749078842 counting only the distinct ones).

The product of its (nonzero) digits is 3888000, while the sum is 53.

The spelling of 90638538551 in words is "ninety billion, six hundred thirty-eight million, five hundred thirty-eight thousand, five hundred fifty-one".