640225886421 has 8 divisors (see below), whose sum is σ = 931237653024. Its totient is φ = 388015688720.

The previous prime is 640225886401. The next prime is 640225886459. The reversal of 640225886421 is 124688522046.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 640225886421 - 2⁵ = 640225886389 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (640225886401) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9700392186 + ... + 9700392251.

It is an arithmetic number, because the mean of its divisors is an integer number (116404706628).

Almost surely, 2^640225886421 is an apocalyptic number.

It is an amenable number.

640225886421 is a deficient number, since it is larger than the sum of its proper divisors (291011766603).

640225886421 is a wasteful number, since it uses less digits than its factorization.

640225886421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19400784451.

The product of its (nonzero) digits is 1474560, while the sum is 48.

The spelling of 640225886421 in words is "six hundred forty billion, two hundred twenty-five million, eight hundred eighty-six thousand, four hundred twenty-one".