2657842223521 has 9 divisors (see below), whose sum is σ = 2715673536849. Its totient is φ = 2601217395684.

The previous prime is 2657842223513. The next prime is 2657842223539. The reversal of 2657842223521 is 1253222487562.

The square root of 2657842223521 is 1630289.

It is a perfect power (a square), and thus also a powerful number.

It is not a de Polignac number, because 2657842223521 - 2³ = 2657842223513 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2657842223591) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 76606240 + ... + 76640926.

Almost surely, 2^{2657842223521} is an apocalyptic number.

2657842223521 is the 1630289-th square number.

2657842223521 is the 815145-th centered octagonal number.

It is an amenable number.

2657842223521 is a deficient number, since it is larger than the sum of its proper divisors (57831313328).

2657842223521 is an frugal number, since it uses more digits than its factorization.

2657842223521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69468 (or 34734 counting only the distinct ones).

The product of its digits is 3225600, while the sum is 49.

Multiplying 2657842223521 by its sum of digits (49), we get a square (130234268952529 = 11412023²).

The spelling of 2657842223521 in words is "two trillion, six hundred fifty-seven billion, eight hundred forty-two million, two hundred twenty-three thousand, five hundred twenty-one".