2640435251 has 2 divisors, whose sum is σ = 2640435252. Its totient is φ = 2640435250.

The previous prime is 2640435211. The next prime is 2640435269. The reversal of 2640435251 is 1525340462.

2640435251 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 2640435251 - 2¹⁴ = 2640418867 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (2640435211) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1320217625 + 1320217626.

It is an arithmetic number, because the mean of its divisors is an integer number (1320217626).

Almost surely, 2^2640435251 is an apocalyptic number.

2640435251 is a deficient number, since it is larger than the sum of its proper divisors (1).

2640435251 is an equidigital number, since it uses as much as digits as its factorization.

2640435251 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 28800, while the sum is 32.

The square root of 2640435251 is about 51385.1656706486. The cubic root of 2640435251 is about 1382.1605955816.

The spelling of 2640435251 in words is "two billion, six hundred forty million, four hundred thirty-five thousand, two hundred fifty-one".