90816605501 has 2 divisors, whose sum is σ = 90816605502. Its totient is φ = 90816605500.

The previous prime is 90816605491. The next prime is 90816605513. The reversal of 90816605501 is 10550661809.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 74801703001 + 16014902500 = 273499^2 + 126550^2 .

It is a cyclic number.

It is not a de Polignac number, because 90816605501 - 2¹⁰ = 90816604477 is a prime.

It is a super-2 number, since 2×90816605501² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (90816605401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45408302750 + 45408302751.

It is an arithmetic number, because the mean of its divisors is an integer number (45408302751).

Almost surely, 2^90816605501 is an apocalyptic number.

It is an amenable number.

90816605501 is a deficient number, since it is larger than the sum of its proper divisors (1).

90816605501 is an equidigital number, since it uses as much as digits as its factorization.

90816605501 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 64800, while the sum is 41.

The spelling of 90816605501 in words is "ninety billion, eight hundred sixteen million, six hundred five thousand, five hundred one".