66057719 has 8 divisors (see below), whose sum is σ = 81301920. Its totient is φ = 52265376.

The previous prime is 66057709. The next prime is 66057721. The reversal of 66057719 is 91775066.

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

It is a cyclic number.

It is not a de Polignac number, because 66057719 - 2⁴ = 66057703 is a prime.

It is a super-2 number, since 2×66057719² = 8727244478965922, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66057709) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 362864 + ... + 363045.

It is an arithmetic number, because the mean of its divisors is an integer number (10162740).

Almost surely, 2^66057719 is an apocalyptic number.

66057719 is a deficient number, since it is larger than the sum of its proper divisors (15244201).

66057719 is a wasteful number, since it uses less digits than its factorization.

66057719 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 725929.

The product of its (nonzero) digits is 79380, while the sum is 41.

The square root of 66057719 is about 8127.5899871979. The cubic root of 66057719 is about 404.2417739659.

The spelling of 66057719 in words is "sixty-six million, fifty-seven thousand, seven hundred nineteen".