35642761621 has 2 divisors, whose sum is σ = 35642761622. Its totient is φ = 35642761620.

The previous prime is 35642761613. The next prime is 35642761631. The reversal of 35642761621 is 12616724653.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 28085067396 + 7557694225 = 167586^2 + 86935^2 .

It is a cyclic number.

It is not a de Polignac number, because 35642761621 - 2³ = 35642761613 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (35642761631) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 17821380810 + 17821380811.

It is an arithmetic number, because the mean of its divisors is an integer number (17821380811).

Almost surely, 2^35642761621 is an apocalyptic number.

It is an amenable number.

35642761621 is a deficient number, since it is larger than the sum of its proper divisors (1).

35642761621 is an equidigital number, since it uses as much as digits as its factorization.

35642761621 is an evil number, because the sum of its binary digits is even.

The product of its digits is 362880, while the sum is 43.

The spelling of 35642761621 in words is "thirty-five billion, six hundred forty-two million, seven hundred sixty-one thousand, six hundred twenty-one".