6642635654 has 4 divisors (see below), whose sum is σ = 9963953484. Its totient is φ = 3321317826.

The previous prime is 6642635653. The next prime is 6642635669. The reversal of 6642635654 is 4565362466.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a junction number, because it is equal to n+sod(n) for n = 6642635599 and 6642635608.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6642635653) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1660658912 + ... + 1660658915.

It is an arithmetic number, because the mean of its divisors is an integer number (2490988371).

Almost surely, 2^6642635654 is an apocalyptic number.

6642635654 is a deficient number, since it is larger than the sum of its proper divisors (3321317830).

6642635654 is a wasteful number, since it uses less digits than its factorization.

6642635654 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3321317829.

The product of its digits is 3110400, while the sum is 47.

The square root of 6642635654 is about 81502.3659411185. The cubic root of 6642635654 is about 1879.8079302421.

The spelling of 6642635654 in words is "six billion, six hundred forty-two million, six hundred thirty-five thousand, six hundred fifty-four".