2657240657 has 2 divisors, whose sum is σ = 2657240658. Its totient is φ = 2657240656.

The previous prime is 2657240653. The next prime is 2657240683. The reversal of 2657240657 is 7560427562.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2185656001 + 471584656 = 46751^2 + 21716^2 .

It is a cyclic number.

It is not a de Polignac number, because 2657240657 - 2² = 2657240653 is a prime.

It is not a weakly prime, because it can be changed into another prime (2657240653) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1328620328 + 1328620329.

It is an arithmetic number, because the mean of its divisors is an integer number (1328620329).

Almost surely, 2^2657240657 is an apocalyptic number.

It is an amenable number.

2657240657 is a deficient number, since it is larger than the sum of its proper divisors (1).

2657240657 is an equidigital number, since it uses as much as digits as its factorization.

2657240657 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 705600, while the sum is 44.

The square root of 2657240657 is about 51548.4302088822. The cubic root of 2657240657 is about 1385.0867122397.

The spelling of 2657240657 in words is "two billion, six hundred fifty-seven million, two hundred forty thousand, six hundred fifty-seven".