61644210036018 has 16 divisors (see below), whose sum is σ = 123400806976800. Its totient is φ = 20529338861216.

The previous prime is 61644210035999. The next prime is 61644210036041. The reversal of 61644210036018 is 81063001244616.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4682780568 + ... + 4682793731.

It is an arithmetic number, because the mean of its divisors is an integer number (7712550436050).

Almost surely, 2^{61644210036018} is an apocalyptic number.

61644210036018 is an abundant number, since it is smaller than the sum of its proper divisors (61756596940782).

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

61644210036018 is a wasteful number, since it uses less digits than its factorization.

61644210036018 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9365575401.

The product of its (nonzero) digits is 165888, while the sum is 42.

The spelling of 61644210036018 in words is "sixty-one trillion, six hundred forty-four billion, two hundred ten million, thirty-six thousand, eighteen".