66156644 has 12 divisors (see below), whose sum is σ = 117169584. Its totient is φ = 32679624.

The previous prime is 66156617. The next prime is 66156659. The reversal of 66156644 is 44665166.

It is a junction number, because it is equal to n+sod(n) for n = 66156598 and 66156607.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 99302 + ... + 99965.

It is an arithmetic number, because the mean of its divisors is an integer number (9764132).

Almost surely, 2^66156644 is an apocalyptic number.

It is an amenable number.

66156644 is a deficient number, since it is larger than the sum of its proper divisors (51012940).

66156644 is a wasteful number, since it uses less digits than its factorization.

66156644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 199354 (or 199352 counting only the distinct ones).

The product of its digits is 103680, while the sum is 38.

The square root of 66156644 is about 8133.6734628334. The cubic root of 66156644 is about 404.4434646110.

The spelling of 66156644 in words is "sixty-six million, one hundred fifty-six thousand, six hundred forty-four".