640144674427 has 16 divisors (see below), whose sum is σ = 671553997632. Its totient is φ = 609041917440.

The previous prime is 640144674419. The next prime is 640144674431. The reversal of 640144674427 is 724476441046.

640144674427 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 640144674427 - 2³ = 640144674419 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (640144674457) 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, 3235927 + ... + 3428047.

It is an arithmetic number, because the mean of its divisors is an integer number (41972124852).

Almost surely, 2^640144674427 is an apocalyptic number.

640144674427 is a deficient number, since it is larger than the sum of its proper divisors (31409323205).

640144674427 is a wasteful number, since it uses less digits than its factorization.

640144674427 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 192918.

The product of its (nonzero) digits is 3612672, while the sum is 49.

The spelling of 640144674427 in words is "six hundred forty billion, one hundred forty-four million, six hundred seventy-four thousand, four hundred twenty-seven".