649068100681 has 72 divisors (see below), whose sum is σ = 893728080000. Its totient is φ = 465911671680.

The previous prime is 649068100651. The next prime is 649068100697. The reversal of 649068100681 is 186001860946.

It is not a de Polignac number, because 649068100681 - 2⁵ = 649068100649 is a prime.

It is a super-2 number, since 2×649068100681² (a number of 24 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (49).

It is not an unprimeable number, because it can be changed into a prime (649068100621) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 46358320 + ... + 46372318.

It is an arithmetic number, because the mean of its divisors is an integer number (12412890000).

Almost surely, 2^649068100681 is an apocalyptic number.

It is an amenable number.

649068100681 is a deficient number, since it is larger than the sum of its proper divisors (244659979319).

649068100681 is a wasteful number, since it uses less digits than its factorization.

649068100681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14559 (or 14539 counting only the distinct ones).

The product of its (nonzero) digits is 497664, while the sum is 49.

The spelling of 649068100681 in words is "six hundred forty-nine billion, sixty-eight million, one hundred thousand, six hundred eighty-one".