656212545218 has 8 divisors (see below), whose sum is σ = 1042219924812. Its totient is φ = 308805903616.

The previous prime is 656212545217. The next prime is 656212545253. The reversal of 656212545218 is 812545212656.

It can be written as a sum of positive squares in 2 ways, for example, as 639707233489 + 16505311729 = 799817^2 + 128473^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×656212545218² (a number of 24 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (656212545217) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9650184455 + ... + 9650184522.

Almost surely, 2^656212545218 is an apocalyptic number.

656212545218 is a deficient number, since it is larger than the sum of its proper divisors (386007379594).

656212545218 is a wasteful number, since it uses less digits than its factorization.

656212545218 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19300368996.

The product of its digits is 1152000, while the sum is 47.

The spelling of 656212545218 in words is "six hundred fifty-six billion, two hundred twelve million, five hundred forty-five thousand, two hundred eighteen".