211681557156 has 24 divisors (see below), whose sum is σ = 494411246784. Its totient is φ = 70490860000.

The previous prime is 211681557133. The next prime is 211681557163. The reversal of 211681557156 is 651755186112.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8694720 + ... + 8719031.

It is an arithmetic number, because the mean of its divisors is an integer number (20600468616).

Almost surely, 2^211681557156 is an apocalyptic number.

It is an amenable number.

211681557156 is an abundant number, since it is smaller than the sum of its proper divisors (282729689628).

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

211681557156 is a wasteful number, since it uses less digits than its factorization.

211681557156 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17414771 (or 17414769 counting only the distinct ones).

The product of its digits is 504000, while the sum is 48.

The spelling of 211681557156 in words is "two hundred eleven billion, six hundred eighty-one million, five hundred fifty-seven thousand, one hundred fifty-six".