90621388651 has 2 divisors, whose sum is σ = 90621388652. Its totient is φ = 90621388650.

The previous prime is 90621388633. The next prime is 90621388661. The reversal of 90621388651 is 15688312609.

It is a strong prime.

It is an emirp because it is prime and its reverse (15688312609) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 90621388651 - 2⁵ = 90621388619 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 90621388595 and 90621388604.

It is not a weakly prime, because it can be changed into another prime (90621388661) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45310694325 + 45310694326.

It is an arithmetic number, because the mean of its divisors is an integer number (45310694326).

Almost surely, 2^90621388651 is an apocalyptic number.

90621388651 is a deficient number, since it is larger than the sum of its proper divisors (1).

90621388651 is an equidigital number, since it uses as much as digits as its factorization.

90621388651 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 622080, while the sum is 49.

The spelling of 90621388651 in words is "ninety billion, six hundred twenty-one million, three hundred eighty-eight thousand, six hundred fifty-one".