77089431051973 has 2 divisors, whose sum is σ = 77089431051974. Its totient is φ = 77089431051972.

The previous prime is 77089431051917. The next prime is 77089431051989. The reversal of 77089431051973 is 37915013498077.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 73766678095009 + 3322752956964 = 8588753^2 + 1822842^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-77089431051973 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (77089431051173) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38544715525986 + 38544715525987.

It is an arithmetic number, because the mean of its divisors is an integer number (38544715525987).

Almost surely, 2^{77089431051973} is an apocalyptic number.

It is an amenable number.

77089431051973 is a deficient number, since it is larger than the sum of its proper divisors (1).

77089431051973 is an equidigital number, since it uses as much as digits as its factorization.

77089431051973 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 40007520, while the sum is 64.

The spelling of 77089431051973 in words is "seventy-seven trillion, eighty-nine billion, four hundred thirty-one million, fifty-one thousand, nine hundred seventy-three".