61311743999 has 8 divisors (see below), whose sum is σ = 66897616080. Its totient is φ = 55727884800.

The previous prime is 61311743989. The next prime is 61311744017. The reversal of 61311743999 is 99934711316.

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 not a de Polignac number, because 61311743999 - 2⁸ = 61311743743 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 61311743999.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61311743939) 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, 439172 + ... + 561689.

It is an arithmetic number, because the mean of its divisors is an integer number (8362202010).

Almost surely, 2^61311743999 is an apocalyptic number.

61311743999 is a deficient number, since it is larger than the sum of its proper divisors (5585872081).

61311743999 is a wasteful number, since it uses less digits than its factorization.

61311743999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1006441.

The product of its digits is 1102248, while the sum is 53.

The spelling of 61311743999 in words is "sixty-one billion, three hundred eleven million, seven hundred forty-three thousand, nine hundred ninety-nine".