212860400178 has 16 divisors (see below), whose sum is σ = 427596225120. Its totient is φ = 70640895936.

The previous prime is 212860400149. The next prime is 212860400209. The reversal of 212860400178 is 871004068212.

It is a happy number.

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, 78141223 + ... + 78143946.

It is an arithmetic number, because the mean of its divisors is an integer number (26724764070).

Almost surely, 2^212860400178 is an apocalyptic number.

212860400178 is an abundant number, since it is smaller than the sum of its proper divisors (214735824942).

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

212860400178 is a wasteful number, since it uses less digits than its factorization.

212860400178 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 156285401.

The product of its (nonzero) digits is 43008, while the sum is 39.

The spelling of 212860400178 in words is "two hundred twelve billion, eight hundred sixty million, four hundred thousand, one hundred seventy-eight".