61641215982 has 24 divisors (see below), whose sum is σ = 137864226240. Its totient is φ = 19884263040.

The previous prime is 61641215981. The next prime is 61641216023. The reversal of 61641215982 is 28951214616.

61641215982 is a `hidden beast` number, since 6 + 1 + 6 + 412 + 159 + 82 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61641215981) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 55233507 + ... + 55234622.

It is an arithmetic number, because the mean of its divisors is an integer number (5744342760).

Almost surely, 2^61641215982 is an apocalyptic number.

61641215982 is a gapful number since it is divisible by the number (62) formed by its first and last digit.

61641215982 is an abundant number, since it is smaller than the sum of its proper divisors (76223010258).

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

61641215982 is a wasteful number, since it uses less digits than its factorization.

61641215982 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 110468168 (or 110468165 counting only the distinct ones).

The product of its digits is 207360, while the sum is 45.

The spelling of 61641215982 in words is "sixty-one billion, six hundred forty-one million, two hundred fifteen thousand, nine hundred eighty-two".