6406649625 has 32 divisors (see below), whose sum is σ = 10668737664. Its totient is φ = 3414292800.

The previous prime is 6406649621. The next prime is 6406649633. The reversal of 6406649625 is 5269466046.

It is not a de Polignac number, because 6406649625 - 2² = 6406649621 is a prime.

It is a Smith number, since the sum of its digits (48) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (6406649621) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 554154 + ... + 565596.

It is an arithmetic number, because the mean of its divisors is an integer number (333398052).

Almost surely, 2^6406649625 is an apocalyptic number.

It is an amenable number.

6406649625 is a deficient number, since it is larger than the sum of its proper divisors (4262088039).

6406649625 is a wasteful number, since it uses less digits than its factorization.

6406649625 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12954 (or 12944 counting only the distinct ones).

The product of its (nonzero) digits is 1866240, while the sum is 48.

The square root of 6406649625 is about 80041.5493665634. The cubic root of 6406649625 is about 1857.2783280650.

The spelling of 6406649625 in words is "six billion, four hundred six million, six hundred forty-nine thousand, six hundred twenty-five".