646465537 has 8 divisors (see below), whose sum is σ = 678631680. Its totient is φ = 615006480.

The previous prime is 646465529. The next prime is 646465541. The reversal of 646465537 is 735564646.

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 646465537 - 2³ = 646465529 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (646465037) 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, 174898 + ... + 178555.

It is an arithmetic number, because the mean of its divisors is an integer number (84828960).

Almost surely, 2^646465537 is an apocalyptic number.

It is an amenable number.

646465537 is a deficient number, since it is larger than the sum of its proper divisors (32166143).

646465537 is a wasteful number, since it uses less digits than its factorization.

646465537 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 353543.

The product of its digits is 1814400, while the sum is 46.

The square root of 646465537 is about 25425.6865590686. The cubic root of 646465537 is about 864.6661533697. Note that the first 3 decimals are identical.

The spelling of 646465537 in words is "six hundred forty-six million, four hundred sixty-five thousand, five hundred thirty-seven".