66900001 has 4 divisors (see below), whose sum is σ = 76457152. Its totient is φ = 57342852.

The previous prime is 66899999. The next prime is 66900017. The reversal of 66900001 is 10000966.

66900001 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 not a de Polignac number, because 66900001 - 2¹ = 66899999 is a prime.

It is a super-2 number, since 2×66900001² = 8951220267600002, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66900091) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4778565 + ... + 4778578.

It is an arithmetic number, because the mean of its divisors is an integer number (19114288).

Almost surely, 2^66900001 is an apocalyptic number.

It is an amenable number.

66900001 is a deficient number, since it is larger than the sum of its proper divisors (9557151).

66900001 is an equidigital number, since it uses as much as digits as its factorization.

66900001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9557150.

The product of its (nonzero) digits is 324, while the sum is 22.

The square root of 66900001 is about 8179.2420798018. The cubic root of 66900001 is about 405.9526443833.

Adding to 66900001 its reverse (10000966), we get a palindrome (76900967).

The spelling of 66900001 in words is "sixty-six million, nine hundred thousand, one".