61189288668 has 36 divisors (see below), whose sum is σ = 154710545808. Its totient is φ = 20391468480.

The previous prime is 61189288661. The next prime is 61189288679. The reversal of 61189288668 is 86688298116.

61189288668 is a `hidden beast` number, since 611 + 8 + 9 + 2 + 8 + 8 + 6 + 6 + 8 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61189288661) 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, 55128 + ... + 354143.

Almost surely, 2^61189288668 is an apocalyptic number.

It is an amenable number.

61189288668 is an abundant number, since it is smaller than the sum of its proper divisors (93521257140).

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

61189288668 is a wasteful number, since it uses less digits than its factorization.

61189288668 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 413434 (or 413429 counting only the distinct ones).

The product of its digits is 15925248, while the sum is 63.

The spelling of 61189288668 in words is "sixty-one billion, one hundred eighty-nine million, two hundred eighty-eight thousand, six hundred sixty-eight".