66155796 has 144 divisors (see below), whose sum is σ = 206693760. Its totient is φ = 17418240.

The previous prime is 66155773. The next prime is 66155827. The reversal of 66155796 is 69755166.

66155796 is a `hidden beast` number, since 6 + 6 + 1 + 557 + 96 = 666.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 196140 + ... + 196476.

Almost surely, 2^66155796 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 66155796, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (103346880).

66155796 is an abundant number, since it is smaller than the sum of its proper divisors (140537964).

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

66155796 is a wasteful number, since it uses less digits than its factorization.

66155796 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 414 (or 409 counting only the distinct ones).

The product of its digits is 340200, while the sum is 45.

The square root of 66155796 is about 8133.6213336988. The cubic root of 66155796 is about 404.4417365430.

The spelling of 66155796 in words is "sixty-six million, one hundred fifty-five thousand, seven hundred ninety-six".