66794587 has 4 divisors (see below), whose sum is σ = 66943800. Its totient is φ = 66645376.

The previous prime is 66794561. The next prime is 66794591. The reversal of 66794587 is 78549766.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 78549766 = 2 ⋅39274883.

It is a cyclic number.

It is not a de Polignac number, because 66794587 - 2²³ = 58405979 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66794527) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 73933 + ... + 74830.

It is an arithmetic number, because the mean of its divisors is an integer number (16735950).

Almost surely, 2^66794587 is an apocalyptic number.

66794587 is a deficient number, since it is larger than the sum of its proper divisors (149213).

66794587 is a wasteful number, since it uses less digits than its factorization.

66794587 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 149212.

The product of its digits is 2540160, while the sum is 52.

The square root of 66794587 is about 8172.7955437537. The cubic root of 66794587 is about 405.7393131057.

The spelling of 66794587 in words is "sixty-six million, seven hundred ninety-four thousand, five hundred eighty-seven".