217837581042 has 16 divisors (see below), whose sum is σ = 435694738752. Its totient is φ = 72609264240.

The previous prime is 217837581019. The next prime is 217837581043. The reversal of 217837581042 is 240185738712.

It is a junction number, because it is equal to n+sod(n) for n = 217837580982 and 217837581000.

It is not an unprimeable number, because it can be changed into a prime (217837581043) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 669009 + ... + 939812.

It is an arithmetic number, because the mean of its divisors is an integer number (27230921172).

Almost surely, 2^217837581042 is an apocalyptic number.

217837581042 is an abundant number, since it is smaller than the sum of its proper divisors (217857157710).

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

217837581042 is a wasteful number, since it uses less digits than its factorization.

217837581042 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1631393.

The product of its (nonzero) digits is 752640, while the sum is 48.

The spelling of 217837581042 in words is "two hundred seventeen billion, eight hundred thirty-seven million, five hundred eighty-one thousand, forty-two".