640151018468 has 12 divisors (see below), whose sum is σ = 1206438457980. Its totient is φ = 295454316192.

The previous prime is 640151018461. The next prime is 640151018491. The reversal of 640151018468 is 864810151046.

It can be written as a sum of positive squares in 2 ways, for example, as 72370684324 + 567780334144 = 269018^2 + 753512^2 .

It is not an unprimeable number, because it can be changed into a prime (640151018461) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6155298203 + ... + 6155298306.

It is an arithmetic number, because the mean of its divisors is an integer number (100536538165).

Almost surely, 2^640151018468 is an apocalyptic number.

It is an amenable number.

640151018468 is a deficient number, since it is larger than the sum of its proper divisors (566287439512).

640151018468 is a wasteful number, since it uses less digits than its factorization.

640151018468 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12310596526 (or 12310596524 counting only the distinct ones).

The product of its (nonzero) digits is 184320, while the sum is 44.

The spelling of 640151018468 in words is "six hundred forty billion, one hundred fifty-one million, eighteen thousand, four hundred sixty-eight".