66926161 has 4 divisors (see below), whose sum is σ = 70863012. Its totient is φ = 62989312.

The previous prime is 66926147. The next prime is 66926173. The reversal of 66926161 is 16162966.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 54982225 + 11943936 = 7415^2 + 3456^2 .

It is a cyclic number.

It is not a de Polignac number, because 66926161 - 2⁵ = 66926129 is a prime.

It is a super-2 number, since 2×66926161² = 8958222052395842, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 66926161.

It is not an unprimeable number, because it can be changed into a prime (66921161) 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, 1968400 + ... + 1968433.

It is an arithmetic number, because the mean of its divisors is an integer number (17715753).

Almost surely, 2^66926161 is an apocalyptic number.

It is an amenable number.

66926161 is a deficient number, since it is larger than the sum of its proper divisors (3936851).

66926161 is a wasteful number, since it uses less digits than its factorization.

66926161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3936850.

The product of its digits is 23328, while the sum is 37.

The square root of 66926161 is about 8180.8410936773. The cubic root of 66926161 is about 406.0055508960.

The spelling of 66926161 in words is "sixty-six million, nine hundred twenty-six thousand, one hundred sixty-one".