61217852178 has 48 divisors (see below), whose sum is σ = 142452794880. Its totient is φ = 17487427104.

The previous prime is 61217852177. The next prime is 61217852191. The reversal of 61217852178 is 87125871216.

It is not an unprimeable number, because it can be changed into a prime (61217852177) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1770100 + ... + 1804352.

It is an arithmetic number, because the mean of its divisors is an integer number (2967766560).

Almost surely, 2^61217852178 is an apocalyptic number.

61217852178 is an abundant number, since it is smaller than the sum of its proper divisors (81234942702).

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

61217852178 is a wasteful number, since it uses less digits than its factorization.

61217852178 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40351 (or 40344 counting only the distinct ones).

The product of its digits is 376320, while the sum is 48.

The spelling of 61217852178 in words is "sixty-one billion, two hundred seventeen million, eight hundred fifty-two thousand, one hundred seventy-eight".