649925818 has 8 divisors (see below), whose sum is σ = 1026198720. Its totient is φ = 307859580.

The previous prime is 649925807. The next prime is 649925833. The reversal of 649925818 is 818529946.

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

It is a super-3 number, since 3×649925818³ (a number of 27 digits) contains 333 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8551618 + ... + 8551693.

It is an arithmetic number, because the mean of its divisors is an integer number (128274840).

Almost surely, 2^649925818 is an apocalyptic number.

649925818 is a deficient number, since it is larger than the sum of its proper divisors (376272902).

649925818 is a wasteful number, since it uses less digits than its factorization.

649925818 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17103332.

The product of its digits is 1244160, while the sum is 52.

The square root of 649925818 is about 25493.6426977394. The cubic root of 649925818 is about 866.2061505747.

The spelling of 649925818 in words is "six hundred forty-nine million, nine hundred twenty-five thousand, eight hundred eighteen".