61677717644 has 12 divisors (see below), whose sum is σ = 108004722168. Its totient is φ = 30819225600.

The previous prime is 61677717611. The next prime is 61677717671. The reversal of 61677717644 is 44671777616.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 61677717644.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4901237 + ... + 4913804.

It is an arithmetic number, because the mean of its divisors is an integer number (9000393514).

Almost surely, 2^61677717644 is an apocalyptic number.

It is an amenable number.

61677717644 is a deficient number, since it is larger than the sum of its proper divisors (46327004524).

61677717644 is a wasteful number, since it uses less digits than its factorization.

61677717644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9816616 (or 9816614 counting only the distinct ones).

The product of its digits is 8297856, while the sum is 56.

The spelling of 61677717644 in words is "sixty-one billion, six hundred seventy-seven million, seven hundred seventeen thousand, six hundred forty-four".