215466678018 has 32 divisors (see below), whose sum is σ = 478893648000. Its totient is φ = 71810404848.

The previous prime is 215466677999. The next prime is 215466678019. The reversal of 215466678018 is 810876664512.

It is a super-2 number, since 2×215466678018² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is not an unprimeable number, because it can be changed into a prime (215466678019) 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, 5883 + ... + 656481.

It is an arithmetic number, because the mean of its divisors is an integer number (14965426500).

Almost surely, 2^215466678018 is an apocalyptic number.

215466678018 is an abundant number, since it is smaller than the sum of its proper divisors (263426969982).

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

215466678018 is a wasteful number, since it uses less digits than its factorization.

215466678018 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 656743 (or 656737 counting only the distinct ones).

The product of its (nonzero) digits is 3870720, while the sum is 54.

The spelling of 215466678018 in words is "two hundred fifteen billion, four hundred sixty-six million, six hundred seventy-eight thousand, eighteen".