61665100245 has 96 divisors (see below), whose sum is σ = 129003743232. Its totient is φ = 26638989696.

The previous prime is 61665100181. The next prime is 61665100253. The reversal of 61665100245 is 54200156616.

61665100245 is a `hidden beast` number, since 61 + 66 + 510 + 0 + 24 + 5 = 666.

It is not a de Polignac number, because 61665100245 - 2⁶ = 61665100181 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 550062 + ... + 652608.

It is an arithmetic number, because the mean of its divisors is an integer number (1343788992).

Almost surely, 2^61665100245 is an apocalyptic number.

It is an amenable number.

61665100245 is an abundant number, since it is smaller than the sum of its proper divisors (67338642987).

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

61665100245 is a wasteful number, since it uses less digits than its factorization.

61665100245 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 102671 (or 102668 counting only the distinct ones).

The product of its (nonzero) digits is 43200, while the sum is 36.

The spelling of 61665100245 in words is "sixty-one billion, six hundred sixty-five million, one hundred thousand, two hundred forty-five".