649696907018 has 8 divisors (see below), whose sum is σ = 975935584260. Its totient is φ = 324385045600.

The previous prime is 649696906981. The next prime is 649696907021. The reversal of 649696907018 is 810709696946.

It can be written as a sum of positive squares in 2 ways, for example, as 635539000849 + 14157906169 = 797207^2 + 118987^2 .

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

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, 231702203 + ... + 231705006.

Almost surely, 2^649696907018 is an apocalyptic number.

649696907018 is a deficient number, since it is larger than the sum of its proper divisors (326238677242).

649696907018 is a wasteful number, since it uses less digits than its factorization.

649696907018 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 463407912.

The product of its (nonzero) digits is 35271936, while the sum is 65.

The spelling of 649696907018 in words is "six hundred forty-nine billion, six hundred ninety-six million, nine hundred seven thousand, eighteen".