90816605550 has 72 divisors (see below), whose sum is σ = 266175229320. Its totient is φ = 22016145600.

The previous prime is 90816605513. The next prime is 90816605647. The reversal of 90816605550 is 5550661809.

It is a happy number.

90816605550 is a `hidden beast` number, since 90 + 8 + 1 + 6 + 6 + 0 + 5 + 550 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a junction number, because it is equal to n+sod(n) for n = 90816605496 and 90816605505.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 9168445 + ... + 9178344.

It is an arithmetic number, because the mean of its divisors is an integer number (3696878185).

Almost surely, 2^90816605550 is an apocalyptic number.

90816605550 is a gapful number since it is divisible by the number (90) formed by its first and last digit.

90816605550 is an abundant number, since it is smaller than the sum of its proper divisors (175358623770).

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

90816605550 is a wasteful number, since it uses less digits than its factorization.

90816605550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18346818 (or 18346810 counting only the distinct ones).

The product of its (nonzero) digits is 324000, while the sum is 45.

The spelling of 90816605550 in words is "ninety billion, eight hundred sixteen million, six hundred five thousand, five hundred fifty".