66861058 has 8 divisors (see below), whose sum is σ = 109409040. Its totient is φ = 30391380.

The previous prime is 66861049. The next prime is 66861073. The reversal of 66861058 is 85016866.

It is a happy number.

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

It is a self number, because there is not a number n which added to its sum of digits gives 66861058.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1519548 + ... + 1519591.

It is an arithmetic number, because the mean of its divisors is an integer number (13676130).

Almost surely, 2^66861058 is an apocalyptic number.

66861058 is a deficient number, since it is larger than the sum of its proper divisors (42547982).

66861058 is a wasteful number, since it uses less digits than its factorization.

66861058 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3039152.

The product of its (nonzero) digits is 69120, while the sum is 40.

The square root of 66861058 is about 8176.8611337114. The cubic root of 66861058 is about 405.8738597191.

It can be divided in two parts, 6686 and 1058, that added together give a square (7744 = 88²).

The spelling of 66861058 in words is "sixty-six million, eight hundred sixty-one thousand, fifty-eight".