640653517441 has 16 divisors (see below), whose sum is σ = 750533506560. Its totient is φ = 535449913920.

The previous prime is 640653517423. The next prime is 640653517523. The reversal of 640653517441 is 144715356046.

It is a happy number.

It is not a de Polignac number, because 640653517441 - 2⁵ = 640653517409 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 640653517391 and 640653517400.

It is not an unprimeable number, because it can be changed into a prime (640653514441) 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, 3530970 + ... + 3707971.

It is an arithmetic number, because the mean of its divisors is an integer number (46908344160).

Almost surely, 2^640653517441 is an apocalyptic number.

It is an amenable number.

640653517441 is a deficient number, since it is larger than the sum of its proper divisors (109879989119).

640653517441 is a wasteful number, since it uses less digits than its factorization.

640653517441 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7239264.

The product of its (nonzero) digits is 1209600, while the sum is 46.

The spelling of 640653517441 in words is "six hundred forty billion, six hundred fifty-three million, five hundred seventeen thousand, four hundred forty-one".