84993357945557 has 2 divisors, whose sum is σ = 84993357945558. Its totient is φ = 84993357945556.

The previous prime is 84993357945533. The next prime is 84993357945667. The reversal of 84993357945557 is 75554975339948.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 45069081649201 + 39924276296356 = 6713351^2 + 6318566^2 .

It is a cyclic number.

It is not a de Polignac number, because 84993357945557 - 2¹⁴ = 84993357929173 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (84993357945257) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42496678972778 + 42496678972779.

It is an arithmetic number, because the mean of its divisors is an integer number (42496678972779).

Almost surely, 2^{84993357945557} is an apocalyptic number.

It is an amenable number.

84993357945557 is a deficient number, since it is larger than the sum of its proper divisors (1).

84993357945557 is an equidigital number, since it uses as much as digits as its factorization.

84993357945557 is an evil number, because the sum of its binary digits is even.

The product of its digits is 25719120000, while the sum is 83.

The spelling of 84993357945557 in words is "eighty-four trillion, nine hundred ninety-three billion, three hundred fifty-seven million, nine hundred forty-five thousand, five hundred fifty-seven".