656625451 has 8 divisors (see below), whose sum is σ = 661358864. Its totient is φ = 651900960.

The previous prime is 656625449. The next prime is 656625469. The reversal of 656625451 is 154526656.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 656625451 - 2¹ = 656625449 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (656625481) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 223645 + ... + 226561.

It is an arithmetic number, because the mean of its divisors is an integer number (82669858).

Almost surely, 2^656625451 is an apocalyptic number.

656625451 is a deficient number, since it is larger than the sum of its proper divisors (4733413).

656625451 is a wasteful number, since it uses less digits than its factorization.

656625451 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4461.

The product of its digits is 216000, while the sum is 40.

The square root of 656625451 is about 25624.7039202407. The cubic root of 656625451 is about 869.1723537770.

The spelling of 656625451 in words is "six hundred fifty-six million, six hundred twenty-five thousand, four hundred fifty-one".