61443665456 has 10 divisors (see below), whose sum is σ = 119047101852. Its totient is φ = 30721832720.

The previous prime is 61443665449. The next prime is 61443665509. The reversal of 61443665456 is 65456634416.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1920114530 + ... + 1920114561.

Almost surely, 2^61443665456 is an apocalyptic number.

It is an amenable number.

61443665456 is a deficient number, since it is larger than the sum of its proper divisors (57603436396).

61443665456 is a wasteful number, since it uses less digits than its factorization.

61443665456 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3840229099 (or 3840229093 counting only the distinct ones).

The product of its digits is 6220800, while the sum is 50.

The spelling of 61443665456 in words is "sixty-one billion, four hundred forty-three million, six hundred sixty-five thousand, four hundred fifty-six".