66666633 has 32 divisors (see below), whose sum is σ = 101025792. Its totient is φ = 38750400.

The previous prime is 66666631. The next prime is 66666643. The reversal of 66666633 is 33666666.

It is not a de Polignac number, because 66666633 - 2¹ = 66666631 is a prime.

It is a nialpdrome in base 10.

It is a zygodrome in base 10.

It is not an unprimeable number, because it can be changed into a prime (66666631) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 81798 + ... + 82608.

It is an arithmetic number, because the mean of its divisors is an integer number (3157056).

Almost surely, 2^66666633 is an apocalyptic number.

It is an amenable number.

66666633 is a deficient number, since it is larger than the sum of its proper divisors (34359159).

66666633 is a wasteful number, since it uses less digits than its factorization.

66666633 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 925.

The product of its digits is 419904, while the sum is 42.

The square root of 66666633 is about 8164.9637476231. The cubic root of 66666633 is about 405.4800647824.

It can be divided in two parts, 6666663 and 3, that added together give a palindrome (6666666).

The spelling of 66666633 in words is "sixty-six million, six hundred sixty-six thousand, six hundred thirty-three".