66163601 has 4 divisors (see below), whose sum is σ = 75615552. Its totient is φ = 56711652.

The previous prime is 66163597. The next prime is 66163613. The reversal of 66163601 is 10636166.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 66163601 - 2² = 66163597 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66163631) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4725965 + ... + 4725978.

It is an arithmetic number, because the mean of its divisors is an integer number (18903888).

Almost surely, 2^66163601 is an apocalyptic number.

It is an amenable number.

66163601 is a deficient number, since it is larger than the sum of its proper divisors (9451951).

66163601 is an equidigital number, since it uses as much as digits as its factorization.

66163601 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9451950.

The product of its (nonzero) digits is 3888, while the sum is 29.

The square root of 66163601 is about 8134.1011181322. The cubic root of 66163601 is about 404.4576411390.

Adding to 66163601 its reverse (10636166), we get a palindrome (76799767).

The spelling of 66163601 in words is "sixty-six million, one hundred sixty-three thousand, six hundred one".