6561922453 has 4 divisors (see below), whose sum is σ = 6654343968. Its totient is φ = 6469500940.

The previous prime is 6561922417. The next prime is 6561922501. The reversal of 6561922453 is 3542291656.

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 6561922453 - 2⁹ = 6561921941 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6561922153) 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, 46210651 + ... + 46210792.

It is an arithmetic number, because the mean of its divisors is an integer number (1663585992).

Almost surely, 2^6561922453 is an apocalyptic number.

It is an amenable number.

6561922453 is a deficient number, since it is larger than the sum of its proper divisors (92421515).

6561922453 is an equidigital number, since it uses as much as digits as its factorization.

6561922453 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 92421514.

The product of its digits is 388800, while the sum is 43.

The square root of 6561922453 is about 81005.6939541907. The cubic root of 6561922453 is about 1872.1631723263.

The spelling of 6561922453 in words is "six billion, five hundred sixty-one million, nine hundred twenty-two thousand, four hundred fifty-three".