61198910658 has 18 divisors (see below), whose sum is σ = 132599913849. Its totient is φ = 20399287032.

The previous prime is 61198910653. The next prime is 61198910713. The reversal of 61198910658 is 85601989116.

61198910658 is a `hidden beast` number, since 611 + 9 + 8 + 9 + 10 + 6 + 5 + 8 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 61165698489 + 33212169 = 247317^2 + 5763^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=174927.

It is not an unprimeable number, because it can be changed into a prime (61198910653) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 1020408 + ... + 1078716.

Almost surely, 2^61198910658 is an apocalyptic number.

61198910658 is an abundant number, since it is smaller than the sum of its proper divisors (71401003191).

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

61198910658 is an frugal number, since it uses more digits than its factorization.

61198910658 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 116626 (or 58314 counting only the distinct ones).

The product of its (nonzero) digits is 933120, while the sum is 54.

The spelling of 61198910658 in words is "sixty-one billion, one hundred ninety-eight million, nine hundred ten thousand, six hundred fifty-eight".