640654614431 has 16 divisors (see below), whose sum is σ = 693634572288. Its totient is φ = 588203839200.

The previous prime is 640654614427. The next prime is 640654614491. The reversal of 640654614431 is 134416456046.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 640654614431 - 2² = 640654614427 is a prime.

It is a super-2 number, since 2×640654614431² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (640654614491) 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, 36965690 + ... + 36983016.

It is an arithmetic number, because the mean of its divisors is an integer number (43352160768).

Almost surely, 2^640654614431 is an apocalyptic number.

640654614431 is a deficient number, since it is larger than the sum of its proper divisors (52979957857).

640654614431 is a wasteful number, since it uses less digits than its factorization.

640654614431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32422.

The product of its (nonzero) digits is 829440, while the sum is 44.

The spelling of 640654614431 in words is "six hundred forty billion, six hundred fifty-four million, six hundred fourteen thousand, four hundred thirty-one".