78077564969 has 2 divisors, whose sum is σ = 78077564970. Its totient is φ = 78077564968.

The previous prime is 78077564927. The next prime is 78077564977. The reversal of 78077564969 is 96946577087.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 62160462400 + 15917102569 = 249320^2 + 126163^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-78077564969 is a prime.

It is a super-2 number, since 2×78077564969² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 78077564899 and 78077564908.

It is not a weakly prime, because it can be changed into another prime (78070564969) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39038782484 + 39038782485.

It is an arithmetic number, because the mean of its divisors is an integer number (39038782485).

Almost surely, 2^78077564969 is an apocalyptic number.

It is an amenable number.

78077564969 is a deficient number, since it is larger than the sum of its proper divisors (1).

78077564969 is an equidigital number, since it uses as much as digits as its factorization.

78077564969 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 160030080, while the sum is 68.

The spelling of 78077564969 in words is "seventy-eight billion, seventy-seven million, five hundred sixty-four thousand, nine hundred sixty-nine".