6406672642 has 4 divisors (see below), whose sum is σ = 9610008966. Its totient is φ = 3203336320.

The previous prime is 6406672637. The next prime is 6406672667. The reversal of 6406672642 is 2462766046.

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

It can be written as a sum of positive squares in only one way, i.e., 6162407001 + 244265641 = 78501^2 + 15629^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1601668159 + ... + 1601668162.

Almost surely, 2^6406672642 is an apocalyptic number.

6406672642 is a deficient number, since it is larger than the sum of its proper divisors (3203336324).

6406672642 is a wasteful number, since it uses less digits than its factorization.

6406672642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3203336323.

The product of its (nonzero) digits is 580608, while the sum is 43.

The square root of 6406672642 is about 80041.6931480088. The cubic root of 6406672642 is about 1857.2805522605.

The spelling of 6406672642 in words is "six billion, four hundred six million, six hundred seventy-two thousand, six hundred forty-two".