66361939 has 4 divisors (see below), whose sum is σ = 75842224. Its totient is φ = 56881656.

The previous prime is 66361921. The next prime is 66361951. The reversal of 66361939 is 93916366.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 93916366 = 2 ⋅46958183.

It is a cyclic number.

It is not a de Polignac number, because 66361939 - 2⁵ = 66361907 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 66361895 and 66361904.

It is not an unprimeable number, because it can be changed into a prime (66311939) 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, 4740132 + ... + 4740145.

It is an arithmetic number, because the mean of its divisors is an integer number (18960556).

Almost surely, 2^66361939 is an apocalyptic number.

66361939 is a deficient number, since it is larger than the sum of its proper divisors (9480285).

66361939 is an equidigital number, since it uses as much as digits as its factorization.

66361939 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9480284.

The product of its digits is 157464, while the sum is 43.

The square root of 66361939 is about 8146.2837539580. The cubic root of 66361939 is about 404.8613842550.

The spelling of 66361939 in words is "sixty-six million, three hundred sixty-one thousand, nine hundred thirty-nine".