80774037661 has 2 divisors, whose sum is σ = 80774037662. Its totient is φ = 80774037660.

The previous prime is 80774037637. The next prime is 80774037683. The reversal of 80774037661 is 16673047708.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 67270203225 + 13503834436 = 259365^2 + 116206^2 .

It is a cyclic number.

It is not a de Polignac number, because 80774037661 - 2²³ = 80765649053 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (80774037361) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40387018830 + 40387018831.

It is an arithmetic number, because the mean of its divisors is an integer number (40387018831).

Almost surely, 2^80774037661 is an apocalyptic number.

It is an amenable number.

80774037661 is a deficient number, since it is larger than the sum of its proper divisors (1).

80774037661 is an equidigital number, since it uses as much as digits as its factorization.

80774037661 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1185408, while the sum is 49.

The spelling of 80774037661 in words is "eighty billion, seven hundred seventy-four million, thirty-seven thousand, six hundred sixty-one".