66155516 has 24 divisors (see below), whose sum is σ = 133195776. Its totient is φ = 28162800.

The previous prime is 66155513. The next prime is 66155527. The reversal of 66155516 is 61555166.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66155513) 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, 3596 + ... + 12051.

It is an arithmetic number, because the mean of its divisors is an integer number (5549824).

Almost surely, 2^66155516 is an apocalyptic number.

It is an amenable number.

66155516 is an abundant number, since it is smaller than the sum of its proper divisors (67040260).

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

66155516 is a wasteful number, since it uses less digits than its factorization.

66155516 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15809 (or 15807 counting only the distinct ones).

The product of its digits is 27000, while the sum is 35.

The square root of 66155516 is about 8133.6041211753. The cubic root of 66155516 is about 404.4411659513.

The spelling of 66155516 in words is "sixty-six million, one hundred fifty-five thousand, five hundred sixteen".