61644442560 has 112 divisors (see below), whose sum is σ = 207234166176. Its totient is φ = 15471542272.

The previous prime is 61644442507. The next prime is 61644442579. The reversal of 61644442560 is 6524444616.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1872297 + ... + 1904936.

Almost surely, 2^61644442560 is an apocalyptic number.

61644442560 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

61644442560 is an abundant number, since it is smaller than the sum of its proper divisors (145589723616).

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

61644442560 is a wasteful number, since it uses less digits than its factorization.

61644442560 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3777270 (or 3777260 counting only the distinct ones).

The product of its (nonzero) digits is 552960, while the sum is 42.

The spelling of 61644442560 in words is "sixty-one billion, six hundred forty-four million, four hundred forty-two thousand, five hundred sixty".