61686699983 has 4 divisors (see below), whose sum is σ = 61996683600. Its totient is φ = 61376716368.

The previous prime is 61686699967. The next prime is 61686699989. The reversal of 61686699983 is 38999668616.

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 61686699983 - 2⁴ = 61686699967 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 (61686699989) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 154991510 + ... + 154991907.

It is an arithmetic number, because the mean of its divisors is an integer number (15499170900).

Almost surely, 2^61686699983 is an apocalyptic number.

61686699983 is a deficient number, since it is larger than the sum of its proper divisors (309983617).

61686699983 is a wasteful number, since it uses less digits than its factorization.

61686699983 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 309983616.

The product of its digits is 181398528, while the sum is 71.

The spelling of 61686699983 in words is "sixty-one billion, six hundred eighty-six million, six hundred ninety-nine thousand, nine hundred eighty-three".