78073274977 has 2 divisors, whose sum is σ = 78073274978. Its totient is φ = 78073274976.

The previous prime is 78073274969. The next prime is 78073275089. The reversal of 78073274977 is 77947237087.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 75916229841 + 2157045136 = 275529^2 + 46444^2 .

It is a cyclic number.

It is not a de Polignac number, because 78073274977 - 2³ = 78073274969 is a prime.

It is not a weakly prime, because it can be changed into another prime (78073974977) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39036637488 + 39036637489.

It is an arithmetic number, because the mean of its divisors is an integer number (39036637489).

Almost surely, 2^78073274977 is an apocalyptic number.

It is an amenable number.

78073274977 is a deficient number, since it is larger than the sum of its proper divisors (1).

78073274977 is an equidigital number, since it uses as much as digits as its factorization.

78073274977 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 29042496, while the sum is 61.

The spelling of 78073274977 in words is "seventy-eight billion, seventy-three million, two hundred seventy-four thousand, nine hundred seventy-seven".