217877040836 has 72 divisors (see below), whose sum is σ = 475980214080. Its totient is φ = 84978411840.

The previous prime is 217877040811. The next prime is 217877040841. The reversal of 217877040836 is 638040778712.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1775555 + ... + 1894293.

Almost surely, 2^217877040836 is an apocalyptic number.

217877040836 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 217877040836, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (237990107040).

217877040836 is an abundant number, since it is smaller than the sum of its proper divisors (258103173244).

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

217877040836 is a wasteful number, since it uses less digits than its factorization.

217877040836 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 118905 (or 118832 counting only the distinct ones).

The product of its (nonzero) digits is 3161088, while the sum is 53.

The spelling of 217877040836 in words is "two hundred seventeen billion, eight hundred seventy-seven million, forty thousand, eight hundred thirty-six".