6642054561 has 16 divisors (see below), whose sum is σ = 9369518400. Its totient is φ = 4173680448.

The previous prime is 6642054553. The next prime is 6642054583. The reversal of 6642054561 is 1654502466.

It is not a de Polignac number, because 6642054561 - 2³ = 6642054553 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (6642054511) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 284526 + ... + 306983.

It is an arithmetic number, because the mean of its divisors is an integer number (585594900).

Almost surely, 2^6642054561 is an apocalyptic number.

It is an amenable number.

6642054561 is a deficient number, since it is larger than the sum of its proper divisors (2727463839).

6642054561 is a wasteful number, since it uses less digits than its factorization.

6642054561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 591728.

The product of its (nonzero) digits is 172800, while the sum is 39.

The square root of 6642054561 is about 81498.8009789101. The cubic root of 6642054561 is about 1879.7531138941.

The spelling of 6642054561 in words is "six billion, six hundred forty-two million, fifty-four thousand, five hundred sixty-one".