6411966557 has 2 divisors, whose sum is σ = 6411966558. Its totient is φ = 6411966556.

The previous prime is 6411966523. The next prime is 6411966569. The reversal of 6411966557 is 7556691146.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3815656441 + 2596310116 = 61771^2 + 50954^2 .

It is a cyclic number.

It is not a de Polignac number, because 6411966557 - 2¹⁰ = 6411965533 is a prime.

It is a super-2 number, since 2×6411966557² = 82226630256172868498, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6411966577) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3205983278 + 3205983279.

It is an arithmetic number, because the mean of its divisors is an integer number (3205983279).

Almost surely, 2^6411966557 is an apocalyptic number.

It is an amenable number.

6411966557 is a deficient number, since it is larger than the sum of its proper divisors (1).

6411966557 is an equidigital number, since it uses as much as digits as its factorization.

6411966557 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1360800, while the sum is 50.

The square root of 6411966557 is about 80074.7560533281. The cubic root of 6411966557 is about 1857.7919762600.

The spelling of 6411966557 in words is "six billion, four hundred eleven million, nine hundred sixty-six thousand, five hundred fifty-seven".