61878389841 has 12 divisors (see below), whose sum is σ = 89712167220. Its totient is φ = 41098904160.

The previous prime is 61878389809. The next prime is 61878389857. The reversal of 61878389841 is 14898387816.

61878389841 is a `hidden beast` number, since 618 + 7 + 8 + 3 + 8 + 9 + 8 + 4 + 1 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 30740258241 + 31138131600 = 175329^2 + 176460^2 .

It is not a de Polignac number, because 61878389841 - 2⁵ = 61878389809 is a prime.

It is not an unprimeable number, because it can be changed into a prime (61878389801) 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 11 ways as a sum of consecutive naturals, for example, 12777090 + ... + 12781931.

It is an arithmetic number, because the mean of its divisors is an integer number (7476013935).

Almost surely, 2^61878389841 is an apocalyptic number.

It is an amenable number.

61878389841 is a deficient number, since it is larger than the sum of its proper divisors (27833777379).

61878389841 is a wasteful number, since it uses less digits than its factorization.

61878389841 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25559296 (or 25559293 counting only the distinct ones).

The product of its digits is 18579456, while the sum is 63.

The spelling of 61878389841 in words is "sixty-one billion, eight hundred seventy-eight million, three hundred eighty-nine thousand, eight hundred forty-one".