2491626563 has 2 divisors, whose sum is σ = 2491626564. Its totient is φ = 2491626562.

The previous prime is 2491626521. The next prime is 2491626601. The reversal of 2491626563 is 3656261942.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 2491626563 - 2¹⁶ = 2491561027 is a prime.

It is not a weakly prime, because it can be changed into another prime (2491626763) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1245813281 + 1245813282.

It is an arithmetic number, because the mean of its divisors is an integer number (1245813282).

Almost surely, 2^2491626563 is an apocalyptic number.

2491626563 is a deficient number, since it is larger than the sum of its proper divisors (1).

2491626563 is an equidigital number, since it uses as much as digits as its factorization.

2491626563 is an evil number, because the sum of its binary digits is even.

The product of its digits is 466560, while the sum is 44.

The square root of 2491626563 is about 49916.1953978866. The cubic root of 2491626563 is about 1355.6918464165.

The spelling of 2491626563 in words is "two billion, four hundred ninety-one million, six hundred twenty-six thousand, five hundred sixty-three".