61644148376864 has 96 divisors (see below), whose sum is σ = 122607828161280. Its totient is φ = 30506980608000.

The previous prime is 61644148376849. The next prime is 61644148376953. The reversal of 61644148376864 is 46867384144616.

It is a junction number, because it is equal to n+sod(n) for n = 61644148376794 and 61644148376803.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2793994697 + ... + 2794016759.

It is an arithmetic number, because the mean of its divisors is an integer number (1277164876680).

Almost surely, 2^{61644148376864} is an apocalyptic number.

It is an amenable number.

61644148376864 is a deficient number, since it is larger than the sum of its proper divisors (60963679784416).

61644148376864 is a wasteful number, since it uses less digits than its factorization.

61644148376864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23914 (or 23906 counting only the distinct ones).

The product of its digits is 445906944, while the sum is 68.

The spelling of 61644148376864 in words is "sixty-one trillion, six hundred forty-four billion, one hundred forty-eight million, three hundred seventy-six thousand, eight hundred sixty-four".