640251514740 has 96 divisors (see below), whose sum is σ = 1876742461440. Its totient is φ = 162778467456.

The previous prime is 640251514729. The next prime is 640251514769. The reversal of 640251514740 is 47415152046.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 331960 + ... + 1179279.

It is an arithmetic number, because the mean of its divisors is an integer number (19549400640).

Almost surely, 2^640251514740 is an apocalyptic number.

640251514740 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

640251514740 is an abundant number, since it is smaller than the sum of its proper divisors (1236490946700).

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

640251514740 is a wasteful number, since it uses less digits than its factorization.

640251514740 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1511581 (or 1511579 counting only the distinct ones).

The product of its (nonzero) digits is 134400, while the sum is 39.

Adding to 640251514740 its reverse (47415152046), we get a palindrome (687666666786).

The spelling of 640251514740 in words is "six hundred forty billion, two hundred fifty-one million, five hundred fourteen thousand, seven hundred forty".