649307441664 has 480 divisors, whose sum is σ = 2340841890816. Its totient is φ = 168966881280.

The previous prime is 649307441569. The next prime is 649307441677. The reversal of 649307441664 is 466144703946.

It is a self number, because there is not a number n which added to its sum of digits gives 649307441664.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 16979814 + ... + 17018010.

Almost surely, 2^649307441664 is an apocalyptic number.

649307441664 is a gapful number since it is divisible by the number (64) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 649307441664, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1170420945408).

649307441664 is an abundant number, since it is smaller than the sum of its proper divisors (1691534449152).

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

649307441664 is a wasteful number, since it uses less digits than its factorization.

649307441664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38276 (or 38257 counting only the distinct ones).

The product of its (nonzero) digits is 10450944, while the sum is 54.

The spelling of 649307441664 in words is "six hundred forty-nine billion, three hundred seven million, four hundred forty-one thousand, six hundred sixty-four".