66159816 has 16 divisors (see below), whose sum is σ = 165399600. Its totient is φ = 22053264.

The previous prime is 66159809. The next prime is 66159823. The reversal of 66159816 is 61895166.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (66159809) and next prime (66159823).

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, 1378306 + ... + 1378353.

It is an arithmetic number, because the mean of its divisors is an integer number (10337475).

Almost surely, 2^66159816 is an apocalyptic number.

It is an amenable number.

66159816 is an abundant number, since it is smaller than the sum of its proper divisors (99239784).

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

66159816 is a wasteful number, since it uses less digits than its factorization.

66159816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2756668 (or 2756664 counting only the distinct ones).

The product of its digits is 77760, while the sum is 42.

The square root of 66159816 is about 8133.8684523417. The cubic root of 66159816 is about 404.4499284322.

The spelling of 66159816 in words is "sixty-six million, one hundred fifty-nine thousand, eight hundred sixteen".