90772952761 has 2 divisors, whose sum is σ = 90772952762. Its totient is φ = 90772952760.

The previous prime is 90772952759. The next prime is 90772952779. The reversal of 90772952761 is 16725927709.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 84471609600 + 6301343161 = 290640^2 + 79381^2 .

It is a cyclic number.

It is not a de Polignac number, because 90772952761 - 2¹ = 90772952759 is a prime.

Together with 90772952759, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (90772952861) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45386476380 + 45386476381.

It is an arithmetic number, because the mean of its divisors is an integer number (45386476381).

Almost surely, 2^90772952761 is an apocalyptic number.

It is an amenable number.

90772952761 is a deficient number, since it is larger than the sum of its proper divisors (1).

90772952761 is an equidigital number, since it uses as much as digits as its factorization.

90772952761 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3333960, while the sum is 55.

The spelling of 90772952761 in words is "ninety billion, seven hundred seventy-two million, nine hundred fifty-two thousand, seven hundred sixty-one".