78198499212 has 24 divisors (see below), whose sum is σ = 183173145456. Its totient is φ = 25964740608.

The previous prime is 78198499163. The next prime is 78198499213. The reversal of 78198499212 is 21299489187.

It is a happy number.

It is a super-2 number, since 2×78198499212² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (78198499213) 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, 12675013 + ... + 12681180.

It is an arithmetic number, because the mean of its divisors is an integer number (7632214394).

Almost surely, 2^78198499212 is an apocalyptic number.

It is an amenable number.

78198499212 is an abundant number, since it is smaller than the sum of its proper divisors (104974646244).

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

78198499212 is a wasteful number, since it uses less digits than its factorization.

78198499212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25356457 (or 25356455 counting only the distinct ones).

The product of its digits is 5225472, while the sum is 60.

The spelling of 78198499212 in words is "seventy-eight billion, one hundred ninety-eight million, four hundred ninety-nine thousand, two hundred twelve".