61306125099 has 4 divisors (see below), whose sum is σ = 81741500136. Its totient is φ = 40870750064.

The previous prime is 61306125091. The next prime is 61306125103. The reversal of 61306125099 is 99052160316.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 61306125099 - 2³ = 61306125091 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 61306125099.

It is not an unprimeable number, because it can be changed into a prime (61306125091) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10217687514 + ... + 10217687519.

It is an arithmetic number, because the mean of its divisors is an integer number (20435375034).

Almost surely, 2^61306125099 is an apocalyptic number.

61306125099 is a deficient number, since it is larger than the sum of its proper divisors (20435375037).

61306125099 is a wasteful number, since it uses less digits than its factorization.

61306125099 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20435375036.

The product of its (nonzero) digits is 87480, while the sum is 42.

The spelling of 61306125099 in words is "sixty-one billion, three hundred six million, one hundred twenty-five thousand, ninety-nine".