61688711999 has 8 divisors (see below), whose sum is σ = 64379478912. Its totient is φ = 58998665880.

The previous prime is 61688711969. The next prime is 61688712013. The reversal of 61688711999 is 99911788616.

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 61688711999 - 2¹² = 61688707903 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61688711969) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1517 + ... + 351254.

It is an arithmetic number, because the mean of its divisors is an integer number (8047434864).

Almost surely, 2^61688711999 is an apocalyptic number.

61688711999 is a deficient number, since it is larger than the sum of its proper divisors (2690766913).

61688711999 is a wasteful number, since it uses less digits than its factorization.

61688711999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 360397.

The product of its digits is 11757312, while the sum is 65.

The spelling of 61688711999 in words is "sixty-one billion, six hundred eighty-eight million, seven hundred eleven thousand, nine hundred ninety-nine".