66940719 has 4 divisors (see below), whose sum is σ = 89254296. Its totient is φ = 44627144.

The previous prime is 66940703. The next prime is 66940759. The reversal of 66940719 is 91704966.

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

It is a cyclic number.

It is not a de Polignac number, because 66940719 - 2⁴ = 66940703 is a prime.

It is a super-2 number, since 2×66940719² = 8962119720473922, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66940759) 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, 11156784 + ... + 11156789.

It is an arithmetic number, because the mean of its divisors is an integer number (22313574).

Almost surely, 2^66940719 is an apocalyptic number.

66940719 is a deficient number, since it is larger than the sum of its proper divisors (22313577).

66940719 is a wasteful number, since it uses less digits than its factorization.

66940719 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22313576.

The product of its (nonzero) digits is 81648, while the sum is 42.

The square root of 66940719 is about 8181.7308071092. The cubic root of 66940719 is about 406.0349873187.

The spelling of 66940719 in words is "sixty-six million, nine hundred forty thousand, seven hundred nineteen".