77546683021 has 2 divisors, whose sum is σ = 77546683022. Its totient is φ = 77546683020.

The previous prime is 77546683009. The next prime is 77546683073. The reversal of 77546683021 is 12038664577.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 54597462921 + 22949220100 = 233661^2 + 151490^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-77546683021 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (77546683001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38773341510 + 38773341511.

It is an arithmetic number, because the mean of its divisors is an integer number (38773341511).

Almost surely, 2^77546683021 is an apocalyptic number.

It is an amenable number.

77546683021 is a deficient number, since it is larger than the sum of its proper divisors (1).

77546683021 is an equidigital number, since it uses as much as digits as its factorization.

77546683021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1693440, while the sum is 49.

The spelling of 77546683021 in words is "seventy-seven billion, five hundred forty-six million, six hundred eighty-three thousand, twenty-one".