66361138 has 8 divisors (see below), whose sum is σ = 99590400. Its totient is φ = 33164340.

The previous prime is 66361123. The next prime is 66361153. The reversal of 66361138 is 83116366.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (66361123) and next prime (66361153).

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2118 + ... + 11713.

It is an arithmetic number, because the mean of its divisors is an integer number (12448800).

Almost surely, 2^66361138 is an apocalyptic number.

66361138 is a deficient number, since it is larger than the sum of its proper divisors (33229262).

66361138 is a wasteful number, since it uses less digits than its factorization.

66361138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16232.

The product of its digits is 15552, while the sum is 34.

The square root of 66361138 is about 8146.2345902877. The cubic root of 66361138 is about 404.8597553329.

The spelling of 66361138 in words is "sixty-six million, three hundred sixty-one thousand, one hundred thirty-eight".