2657240647 has 2 divisors, whose sum is σ = 2657240648. Its totient is φ = 2657240646.

The previous prime is 2657240639. The next prime is 2657240653. The reversal of 2657240647 is 7460427562.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 2657240647 - 2³ = 2657240639 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2657240657) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1328620323 + 1328620324.

It is an arithmetic number, because the mean of its divisors is an integer number (1328620324).

Almost surely, 2^2657240647 is an apocalyptic number.

2657240647 is the 29762-nd hex number.

2657240647 is a deficient number, since it is larger than the sum of its proper divisors (1).

2657240647 is an equidigital number, since it uses as much as digits as its factorization.

2657240647 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 564480, while the sum is 43.

The square root of 2657240647 is about 51548.4301118860. The cubic root of 2657240647 is about 1385.0867105022.

The spelling of 2657240647 in words is "two billion, six hundred fifty-seven million, two hundred forty thousand, six hundred forty-seven".