80428857815557 has 2 divisors, whose sum is σ = 80428857815558. Its totient is φ = 80428857815556.

The previous prime is 80428857815519. The next prime is 80428857815701. The reversal of 80428857815557 is 75551875882408.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 63506379489921 + 16922478325636 = 7969089^2 + 4113694^2 .

It is a cyclic number.

It is not a de Polignac number, because 80428857815557 - 2⁴³ = 71632764793349 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 80428857815557.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (80428857815057) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40214428907778 + 40214428907779.

It is an arithmetic number, because the mean of its divisors is an integer number (40214428907779).

Almost surely, 2^{80428857815557} is an apocalyptic number.

It is an amenable number.

80428857815557 is a deficient number, since it is larger than the sum of its proper divisors (1).

80428857815557 is an equidigital number, since it uses as much as digits as its factorization.

80428857815557 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1003520000, while the sum is 73.

The spelling of 80428857815557 in words is "eighty trillion, four hundred twenty-eight billion, eight hundred fifty-seven million, eight hundred fifteen thousand, five hundred fifty-seven".