2657661953 has 4 divisors (see below), whose sum is σ = 2714208000. Its totient is φ = 2601115908.

The previous prime is 2657661949. The next prime is 2657661967. The reversal of 2657661953 is 3591667562.

It is a happy number.

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 not a de Polignac number, because 2657661953 - 2² = 2657661949 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2657661973) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 28272953 + ... + 28273046.

It is an arithmetic number, because the mean of its divisors is an integer number (678552000).

Almost surely, 2^2657661953 is an apocalyptic number.

It is an amenable number.

2657661953 is a deficient number, since it is larger than the sum of its proper divisors (56546047).

2657661953 is an equidigital number, since it uses as much as digits as its factorization.

2657661953 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56546046.

The product of its digits is 2041200, while the sum is 50.

The square root of 2657661953 is about 51552.5164565223. The cubic root of 2657661953 is about 1385.1599085525.

The spelling of 2657661953 in words is "two billion, six hundred fifty-seven million, six hundred sixty-one thousand, nine hundred fifty-three".