90508167478561 has 4 divisors (see below), whose sum is σ = 103437905689792. Its totient is φ = 77578429267332.

The previous prime is 90508167478517. The next prime is 90508167478601. The reversal of 90508167478561 is 16587476180509.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 90508167478561 - 2⁹ = 90508167478049 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (90508167478961) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6464869105605 + ... + 6464869105618.

It is an arithmetic number, because the mean of its divisors is an integer number (25859476422448).

Almost surely, 2^{90508167478561} is an apocalyptic number.

It is an amenable number.

90508167478561 is a deficient number, since it is larger than the sum of its proper divisors (12929738211231).

90508167478561 is a wasteful number, since it uses less digits than its factorization.

90508167478561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12929738211230.

The product of its (nonzero) digits is 101606400, while the sum is 67.

The spelling of 90508167478561 in words is "ninety trillion, five hundred eight billion, one hundred sixty-seven million, four hundred seventy-eight thousand, five hundred sixty-one".