640254156147 has 12 divisors (see below), whose sum is σ = 935202701160. Its totient is φ = 422040192288.

The previous prime is 640254156067. The next prime is 640254156151. The reversal of 640254156147 is 741651452046.

640254156147 is a `hidden beast` number, since 6 + 4 + 0 + 2 + 5 + 41 + 561 + 47 = 666.

640254156147 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 640254156147 - 2²⁴ = 640237378931 is a prime.

It is a super-3 number, since 3×640254156147³ (a number of 36 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (640254156547) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 399658473 + ... + 399660074.

It is an arithmetic number, because the mean of its divisors is an integer number (77933558430).

Almost surely, 2^640254156147 is an apocalyptic number.

640254156147 is a deficient number, since it is larger than the sum of its proper divisors (294948545013).

640254156147 is a wasteful number, since it uses less digits than its factorization.

640254156147 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 799318642 (or 799318639 counting only the distinct ones).

The product of its (nonzero) digits is 806400, while the sum is 45.

The spelling of 640254156147 in words is "six hundred forty billion, two hundred fifty-four million, one hundred fifty-six thousand, one hundred forty-seven".