66161506 has 8 divisors (see below), whose sum is σ = 100601964. Its totient is φ = 32627520.

The previous prime is 66161503. The next prime is 66161507. The reversal of 66161506 is 60516166.

It can be written as a sum of positive squares in 2 ways, for example, as 65464281 + 697225 = 8091^2 + 835^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (66161503) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 226435 + ... + 226726.

Almost surely, 2^66161506 is an apocalyptic number.

66161506 is a deficient number, since it is larger than the sum of its proper divisors (34440458).

66161506 is a wasteful number, since it uses less digits than its factorization.

66161506 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 453236.

The product of its (nonzero) digits is 6480, while the sum is 31.

The square root of 66161506 is about 8133.9723382859. The cubic root of 66161506 is about 404.4533721871.

The spelling of 66161506 in words is "sixty-six million, one hundred sixty-one thousand, five hundred six".