2657656249 has 4 divisors (see below), whose sum is σ = 2661582564. Its totient is φ = 2653729936.

The previous prime is 2657656201. The next prime is 2657656283. The reversal of 2657656249 is 9426567562.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 2181543849 + 476112400 = 46707^2 + 21820^2 .

It is a cyclic number.

It is not a de Polignac number, because 2657656249 - 2¹³ = 2657648057 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2657656196 and 2657656205.

It is not an unprimeable number, because it can be changed into a prime (2657656349) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1962142 + ... + 1963495.

It is an arithmetic number, because the mean of its divisors is an integer number (665395641).

Almost surely, 2^2657656249 is an apocalyptic number.

It is an amenable number.

2657656249 is a deficient number, since it is larger than the sum of its proper divisors (3926315).

2657656249 is an equidigital number, since it uses as much as digits as its factorization.

2657656249 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3926314.

The product of its digits is 5443200, while the sum is 52.

The square root of 2657656249 is about 51552.4611342659. The cubic root of 2657656249 is about 1385.1589175865.

The spelling of 2657656249 in words is "two billion, six hundred fifty-seven million, six hundred fifty-six thousand, two hundred forty-nine".