61998131195 has 32 divisors (see below), whose sum is σ = 99890703360. Its totient is φ = 35675245440.

The previous prime is 61998131191. The next prime is 61998131243. The reversal of 61998131195 is 59113189916.

It is not a de Polignac number, because 61998131195 - 2² = 61998131191 is a prime.

It is a Smith number, since the sum of its digits (53) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (61998131191) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 6188615 + ... + 6198624.

It is an arithmetic number, because the mean of its divisors is an integer number (3121584480).

Almost surely, 2^61998131195 is an apocalyptic number.

61998131195 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

61998131195 is a deficient number, since it is larger than the sum of its proper divisors (37892572165).

61998131195 is a wasteful number, since it uses less digits than its factorization.

61998131195 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12387275.

The product of its digits is 524880, while the sum is 53.

The spelling of 61998131195 in words is "sixty-one billion, nine hundred ninety-eight million, one hundred thirty-one thousand, one hundred ninety-five".