15660000061644 has 24 divisors (see below), whose sum is σ = 36540094072048. Its totient is φ = 5219986602240.

The previous prime is 15660000061637. The next prime is 15660000061649. The reversal of 15660000061644 is 44616000006651.

It is a happy number.

15660000061644 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-3 number, since 3×15660000061644³ (a number of 41 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (15660000061649) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3937224 + ... + 6842640.

Almost surely, 2^{15660000061644} is an apocalyptic number.

It is an amenable number.

15660000061644 is an abundant number, since it is smaller than the sum of its proper divisors (20880094010404).

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

15660000061644 is a wasteful number, since it uses less digits than its factorization.

15660000061644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3354585 (or 3354583 counting only the distinct ones).

The product of its (nonzero) digits is 103680, while the sum is 39.

The spelling of 15660000061644 in words is "fifteen trillion, six hundred sixty billion, sixty-one thousand, six hundred forty-four".