77086154021 has 2 divisors, whose sum is σ = 77086154022. Its totient is φ = 77086154020.

The previous prime is 77086154003. The next prime is 77086154069. The reversal of 77086154021 is 12045168077.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 63422881921 + 13663272100 = 251839^2 + 116890^2 .

It is a cyclic number.

It is not a de Polignac number, because 77086154021 - 2⁶ = 77086153957 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 77086154021.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (77086154081) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38543077010 + 38543077011.

It is an arithmetic number, because the mean of its divisors is an integer number (38543077011).

Almost surely, 2^77086154021 is an apocalyptic number.

It is an amenable number.

77086154021 is a deficient number, since it is larger than the sum of its proper divisors (1).

77086154021 is an equidigital number, since it uses as much as digits as its factorization.

77086154021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 94080, while the sum is 41.

The spelling of 77086154021 in words is "seventy-seven billion, eighty-six million, one hundred fifty-four thousand, twenty-one".