90091563406551 has 32 divisors (see below), whose sum is σ = 159167979525120. Its totient is φ = 49242593660832.

The previous prime is 90091563406541. The next prime is 90091563406673. The reversal of 90091563406551 is 15560436519009.

90091563406551 is a `hidden beast` number, since 9 + 0 + 0 + 9 + 1 + 56 + 34 + 0 + 6 + 551 = 666.

It is not a de Polignac number, because 90091563406551 - 2⁵ = 90091563406519 is a prime.

It is a super-3 number, since 3×90091563406551³ (a number of 43 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90091563406531) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 10362494320 + ... + 10362503013.

It is an arithmetic number, because the mean of its divisors is an integer number (4973999360160).

Almost surely, 2^{90091563406551} is an apocalyptic number.

90091563406551 is a deficient number, since it is larger than the sum of its proper divisors (69076416118569).

90091563406551 is a wasteful number, since it uses less digits than its factorization.

90091563406551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20724997372 (or 20724997366 counting only the distinct ones).

The product of its (nonzero) digits is 4374000, while the sum is 54.

The spelling of 90091563406551 in words is "ninety trillion, ninety-one billion, five hundred sixty-three million, four hundred six thousand, five hundred fifty-one".