36796720921661 has 2 divisors, whose sum is σ = 36796720921662. Its totient is φ = 36796720921660.

The previous prime is 36796720921657. The next prime is 36796720921687. The reversal of 36796720921661 is 16612902769763.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 32856615020761 + 3940105900900 = 5732069^2 + 1984970^2 .

It is a cyclic number.

It is not a de Polignac number, because 36796720921661 - 2² = 36796720921657 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (36796720921061) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 18398360460830 + 18398360460831.

It is an arithmetic number, because the mean of its divisors is an integer number (18398360460831).

Almost surely, 2^{36796720921661} is an apocalyptic number.

It is an amenable number.

36796720921661 is a deficient number, since it is larger than the sum of its proper divisors (1).

36796720921661 is an equidigital number, since it uses as much as digits as its factorization.

36796720921661 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 61725888, while the sum is 65.

The spelling of 36796720921661 in words is "thirty-six trillion, seven hundred ninety-six billion, seven hundred twenty million, nine hundred twenty-one thousand, six hundred sixty-one".