66170798 has 4 divisors (see below), whose sum is σ = 99256200. Its totient is φ = 33085398.

The previous prime is 66170791. The next prime is 66170807. The reversal of 66170798 is 89707166.

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

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66170791) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16542698 + ... + 16542701.

It is an arithmetic number, because the mean of its divisors is an integer number (24814050).

Almost surely, 2^66170798 is an apocalyptic number.

66170798 is a deficient number, since it is larger than the sum of its proper divisors (33085402).

66170798 is a wasteful number, since it uses less digits than its factorization.

66170798 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33085401.

The product of its (nonzero) digits is 127008, while the sum is 44.

The square root of 66170798 is about 8134.5435028648. The cubic root of 66170798 is about 404.4723056779.

The spelling of 66170798 in words is "sixty-six million, one hundred seventy thousand, seven hundred ninety-eight".