649994918397 has 16 divisors (see below), whose sum is σ = 995207531520. Its totient is φ = 373202823600.

The previous prime is 649994918393. The next prime is 649994918411. The reversal of 649994918397 is 793819499946.

It is not a de Polignac number, because 649994918397 - 2² = 649994918393 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (649994918393) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 518336629 + ... + 518337882.

It is an arithmetic number, because the mean of its divisors is an integer number (62200470720).

Almost surely, 2^649994918397 is an apocalyptic number.

It is an amenable number.

649994918397 is a deficient number, since it is larger than the sum of its proper divisors (345212613123).

649994918397 is a wasteful number, since it uses less digits than its factorization.

649994918397 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1036674544.

The product of its digits is 952342272, while the sum is 78.

The spelling of 649994918397 in words is "six hundred forty-nine billion, nine hundred ninety-four million, nine hundred eighteen thousand, three hundred ninety-seven".