66701806 has 4 divisors (see below), whose sum is σ = 100052712. Its totient is φ = 33350902.

The previous prime is 66701773. The next prime is 66701809. The reversal of 66701806 is 60810766.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 60810766 = 2 ⋅30405383.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66701809) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16675450 + ... + 16675453.

It is an arithmetic number, because the mean of its divisors is an integer number (25013178).

Almost surely, 2^66701806 is an apocalyptic number.

66701806 is a deficient number, since it is larger than the sum of its proper divisors (33350906).

66701806 is a wasteful number, since it uses less digits than its factorization.

66701806 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33350905.

The product of its (nonzero) digits is 12096, while the sum is 34.

The square root of 66701806 is about 8167.1173617134. The cubic root of 66701806 is about 405.5513620328.

The spelling of 66701806 in words is "sixty-six million, seven hundred one thousand, eight hundred six".