640620123662 has 8 divisors (see below), whose sum is σ = 1017455490576. Its totient is φ = 301468293472.

The previous prime is 640620123643. The next prime is 640620123727. The reversal of 640620123662 is 266321026046.

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, 9420884138 + ... + 9420884205.

It is an arithmetic number, because the mean of its divisors is an integer number (127181936322).

Almost surely, 2^640620123662 is an apocalyptic number.

640620123662 is a deficient number, since it is larger than the sum of its proper divisors (376835366914).

640620123662 is a wasteful number, since it uses less digits than its factorization.

640620123662 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18841768362.

The product of its (nonzero) digits is 124416, while the sum is 38.

The spelling of 640620123662 in words is "six hundred forty billion, six hundred twenty million, one hundred twenty-three thousand, six hundred sixty-two".