66401706 has 32 divisors (see below), whose sum is σ = 157011840. Its totient is φ = 18317376.

The previous prime is 66401693. The next prime is 66401719. The reversal of 66401706 is 60710466.

It is an interprime number because it is at equal distance from previous prime (66401693) and next prime (66401719).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 26041 + ... + 28476.

It is an arithmetic number, because the mean of its divisors is an integer number (4906620).

Almost surely, 2^66401706 is an apocalyptic number.

66401706 is an abundant number, since it is smaller than the sum of its proper divisors (90610134).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

66401706 is a wasteful number, since it uses less digits than its factorization.

66401706 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54558.

The product of its (nonzero) digits is 6048, while the sum is 30.

The square root of 66401706 is about 8148.7241946209. The cubic root of 66401706 is about 404.9422383711.

The spelling of 66401706 in words is "sixty-six million, four hundred one thousand, seven hundred six".