80612737721 has 2 divisors, whose sum is σ = 80612737722. Its totient is φ = 80612737720.

The previous prime is 80612737693. The next prime is 80612737741. The reversal of 80612737721 is 12773721608.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 73908403321 + 6704334400 = 271861^2 + 81880^2 .

It is a cyclic number.

It is not a de Polignac number, because 80612737721 - 2¹⁴ = 80612721337 is a prime.

It is not a weakly prime, because it can be changed into another prime (80612737741) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40306368860 + 40306368861.

It is an arithmetic number, because the mean of its divisors is an integer number (40306368861).

Almost surely, 2^80612737721 is an apocalyptic number.

It is an amenable number.

80612737721 is a deficient number, since it is larger than the sum of its proper divisors (1).

80612737721 is an equidigital number, since it uses as much as digits as its factorization.

80612737721 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 197568, while the sum is 44.

The spelling of 80612737721 in words is "eighty billion, six hundred twelve million, seven hundred thirty-seven thousand, seven hundred twenty-one".