649009040681 has 8 divisors (see below), whose sum is σ = 687417394464. Its totient is φ = 610626392640.

The previous prime is 649009040651. The next prime is 649009040683. The reversal of 649009040681 is 186040900946.

It is a happy number.

649009040681 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 649009040681 - 2²⁶ = 648941931817 is a prime.

It is a super-2 number, since 2×649009040681² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (649009040683) 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, 6374435 + ... + 6475448.

It is an arithmetic number, because the mean of its divisors is an integer number (85927174308).

Almost surely, 2^649009040681 is an apocalyptic number.

It is an amenable number.

649009040681 is a deficient number, since it is larger than the sum of its proper divisors (38408353783).

649009040681 is a wasteful number, since it uses less digits than its factorization.

649009040681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12852871.

The product of its (nonzero) digits is 373248, while the sum is 47.

The spelling of 649009040681 in words is "six hundred forty-nine billion, nine million, forty thousand, six hundred eighty-one".