6406660531 has 2 divisors, whose sum is σ = 6406660532. Its totient is φ = 6406660530.

The previous prime is 6406660517. The next prime is 6406660549. The reversal of 6406660531 is 1350666046.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 6406660531 - 2¹³ = 6406652339 is a prime.

It is a super-2 number, since 2×6406660531² = 82090598318946403922, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (6406660571) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3203330265 + 3203330266.

It is an arithmetic number, because the mean of its divisors is an integer number (3203330266).

Almost surely, 2^6406660531 is an apocalyptic number.

6406660531 is a deficient number, since it is larger than the sum of its proper divisors (1).

6406660531 is an equidigital number, since it uses as much as digits as its factorization.

6406660531 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 77760, while the sum is 37.

The square root of 6406660531 is about 80041.6174936514. The cubic root of 6406660531 is about 1857.2793819422.

The spelling of 6406660531 in words is "six billion, four hundred six million, six hundred sixty thousand, five hundred thirty-one".