66061357 has 4 divisors (see below), whose sum is σ = 66374656. Its totient is φ = 65748060.

The previous prime is 66061351. The next prime is 66061363. The reversal of 66061357 is 75316066.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (66061351) and next prime (66061363).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66061357 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66061351) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 156333 + ... + 156754.

It is an arithmetic number, because the mean of its divisors is an integer number (16593664).

Almost surely, 2^66061357 is an apocalyptic number.

It is an amenable number.

66061357 is a deficient number, since it is larger than the sum of its proper divisors (313299).

66061357 is a wasteful number, since it uses less digits than its factorization.

66061357 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 313298.

The product of its (nonzero) digits is 22680, while the sum is 34.

The square root of 66061357 is about 8127.8137896977. The cubic root of 66061357 is about 404.2491947720.

The spelling of 66061357 in words is "sixty-six million, sixty-one thousand, three hundred fifty-seven".