640149015744 has 168 divisors, whose sum is σ = 2109119744160. Its totient is φ = 181842296832.

The previous prime is 640149015697. The next prime is 640149015757. The reversal of 640149015744 is 447510941046.

640149015744 is a `hidden beast` number, since 6 + 4 + 0 + 1 + 490 + 157 + 4 + 4 = 666.

It is a tau number, because it is divible by the number of its divisors (168).

It is a self number, because there is not a number n which added to its sum of digits gives 640149015744.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 238672 + ... + 1156400.

Almost surely, 2^640149015744 is an apocalyptic number.

640149015744 is a gapful number since it is divisible by the number (64) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 640149015744, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1054559872080).

640149015744 is an abundant number, since it is smaller than the sum of its proper divisors (1468970728416).

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

640149015744 is a wasteful number, since it uses less digits than its factorization.

640149015744 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 917927 (or 917914 counting only the distinct ones).

The product of its (nonzero) digits is 483840, while the sum is 45.

The spelling of 640149015744 in words is "six hundred forty billion, one hundred forty-nine million, fifteen thousand, seven hundred forty-four".