78976113661 has 2 divisors, whose sum is σ = 78976113662. Its totient is φ = 78976113660.

The previous prime is 78976113637. The next prime is 78976113677. The reversal of 78976113661 is 16631167987.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 56920893561 + 22055220100 = 238581^2 + 148510^2 .

It is a cyclic number.

It is not a de Polignac number, because 78976113661 - 2⁹ = 78976113149 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78976113611) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39488056830 + 39488056831.

It is an arithmetic number, because the mean of its divisors is an integer number (39488056831).

Almost surely, 2^78976113661 is an apocalyptic number.

It is an amenable number.

78976113661 is a deficient number, since it is larger than the sum of its proper divisors (1).

78976113661 is an equidigital number, since it uses as much as digits as its factorization.

78976113661 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2286144, while the sum is 55.

The spelling of 78976113661 in words is "seventy-eight billion, nine hundred seventy-six million, one hundred thirteen thousand, six hundred sixty-one".