87294638785621 has 2 divisors, whose sum is σ = 87294638785622. Its totient is φ = 87294638785620.

The previous prime is 87294638785493. The next prime is 87294638785681. The reversal of 87294638785621 is 12658783649278.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 73958520807396 + 13336117978225 = 8599914^2 + 3651865^2 .

It is a cyclic number.

It is not a de Polignac number, because 87294638785621 - 2⁷ = 87294638785493 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (87294638785681) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43647319392810 + 43647319392811.

It is an arithmetic number, because the mean of its divisors is an integer number (43647319392811).

Almost surely, 2^{87294638785621} is an apocalyptic number.

It is an amenable number.

87294638785621 is a deficient number, since it is larger than the sum of its proper divisors (1).

87294638785621 is an equidigital number, since it uses as much as digits as its factorization.

87294638785621 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1950842880, while the sum is 76.

The spelling of 87294638785621 in words is "eighty-seven trillion, two hundred ninety-four billion, six hundred thirty-eight million, seven hundred eighty-five thousand, six hundred twenty-one".