646211597658 has 32 divisors (see below), whose sum is σ = 1429774198272. Its totient is φ = 193063642800.

The previous prime is 646211597653. The next prime is 646211597659. The reversal of 646211597658 is 856795112646.

It is not an unprimeable number, because it can be changed into a prime (646211597653) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 68946616 + ... + 68955987.

It is an arithmetic number, because the mean of its divisors is an integer number (44680443696).

Almost surely, 2^646211597658 is an apocalyptic number.

646211597658 is an abundant number, since it is smaller than the sum of its proper divisors (783562600614).

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

646211597658 is a wasteful number, since it uses less digits than its factorization.

646211597658 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 137902690.

The product of its digits is 21772800, while the sum is 60.

The spelling of 646211597658 in words is "six hundred forty-six billion, two hundred eleven million, five hundred ninety-seven thousand, six hundred fifty-eight".