61646312099 has 8 divisors (see below), whose sum is σ = 61697123280. Its totient is φ = 61595526496.

The previous prime is 61646312093. The next prime is 61646312111. The reversal of 61646312099 is 99021364616.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-61646312099 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61646312093) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9944669 + ... + 9950865.

It is an arithmetic number, because the mean of its divisors is an integer number (7712140410).

Almost surely, 2^61646312099 is an apocalyptic number.

61646312099 is a deficient number, since it is larger than the sum of its proper divisors (50811181).

61646312099 is a wasteful number, since it uses less digits than its factorization.

61646312099 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12789.

The product of its (nonzero) digits is 419904, while the sum is 47.

The spelling of 61646312099 in words is "sixty-one billion, six hundred forty-six million, three hundred twelve thousand, ninety-nine".