2520657697 has 4 divisors (see below), whose sum is σ = 2521420480. Its totient is φ = 2519894916.

The previous prime is 2520657679. The next prime is 2520657761. The reversal of 2520657697 is 7967560252.

2520657697 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2520657697 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2520657697.

It is not an unprimeable number, because it can be changed into a prime (2520657197) 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, 376413 + ... + 383050.

It is an arithmetic number, because the mean of its divisors is an integer number (630355120).

Almost surely, 2^2520657697 is an apocalyptic number.

It is an amenable number.

2520657697 is a deficient number, since it is larger than the sum of its proper divisors (762783).

2520657697 is an equidigital number, since it uses as much as digits as its factorization.

2520657697 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 762782.

The product of its (nonzero) digits is 1587600, while the sum is 49.

The square root of 2520657697 is about 50206.1519835966. The cubic root of 2520657697 is about 1360.9367999556.

The spelling of 2520657697 in words is "two billion, five hundred twenty million, six hundred fifty-seven thousand, six hundred ninety-seven".