640656222262 has 8 divisors (see below), whose sum is σ = 1098267809616. Its totient is φ = 274566952392.

The previous prime is 640656222253. The next prime is 640656222277. The reversal of 640656222262 is 262222656046.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22880579353 + ... + 22880579380.

It is an arithmetic number, because the mean of its divisors is an integer number (137283476202).

Almost surely, 2^640656222262 is an apocalyptic number.

640656222262 is a deficient number, since it is larger than the sum of its proper divisors (457611587354).

640656222262 is a wasteful number, since it uses less digits than its factorization.

640656222262 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45761158742.

The product of its (nonzero) digits is 829440, while the sum is 43.

The spelling of 640656222262 in words is "six hundred forty billion, six hundred fifty-six million, two hundred twenty-two thousand, two hundred sixty-two".