649647666732 has 12 divisors (see below), whose sum is σ = 1515844555736. Its totient is φ = 216549222240.

The previous prime is 649647666667. The next prime is 649647666743. The reversal of 649647666732 is 237666746946.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (12).

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, 27068652769 + ... + 27068652792.

Almost surely, 2^649647666732 is an apocalyptic number.

It is an amenable number.

649647666732 is an abundant number, since it is smaller than the sum of its proper divisors (866196889004).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

649647666732 is a wasteful number, since it uses less digits than its factorization.

649647666732 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54137305568 (or 54137305566 counting only the distinct ones).

The product of its digits is 329204736, while the sum is 66.

The spelling of 649647666732 in words is "six hundred forty-nine billion, six hundred forty-seven million, six hundred sixty-six thousand, seven hundred thirty-two".