61619989686 has 12 divisors (see below), whose sum is σ = 123241195476. Its totient is φ = 20539793880.

The previous prime is 61619989679. The next prime is 61619989703. The reversal of 61619989686 is 68698991616.

It is a self number, because there is not a number n which added to its sum of digits gives 61619989686.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 557376 + ... + 658716.

It is an arithmetic number, because the mean of its divisors is an integer number (10270099623).

Almost surely, 2^61619989686 is an apocalyptic number.

61619989686 is an abundant number, since it is smaller than the sum of its proper divisors (61621205790).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

61619989686 is an frugal number, since it uses more digits than its factorization.

61619989686 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 202687 (or 101346 counting only the distinct ones).

The product of its digits is 60466176, while the sum is 69.

The spelling of 61619989686 in words is "sixty-one billion, six hundred nineteen million, nine hundred eighty-nine thousand, six hundred eighty-six".