66820486 has 4 divisors (see below), whose sum is σ = 100230732. Its totient is φ = 33410242.

The previous prime is 66820441. The next prime is 66820513. The reversal of 66820486 is 68402866.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16705120 + ... + 16705123.

It is an arithmetic number, because the mean of its divisors is an integer number (25057683).

Almost surely, 2^66820486 is an apocalyptic number.

66820486 is a deficient number, since it is larger than the sum of its proper divisors (33410246).

66820486 is a wasteful number, since it uses less digits than its factorization.

66820486 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33410245.

The product of its (nonzero) digits is 110592, while the sum is 40.

The square root of 66820486 is about 8174.3798541541. The cubic root of 66820486 is about 405.7917469185.

The spelling of 66820486 in words is "sixty-six million, eight hundred twenty thousand, four hundred eighty-six".