66406907 has 6 divisors (see below), whose sum is σ = 77248908. Its totient is φ = 56920164.

The previous prime is 66406883. The next prime is 66406961. The reversal of 66406907 is 70960466.

It is not a de Polignac number, because 66406907 - 2¹⁰ = 66405883 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66406997) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 677573 + ... + 677670.

It is an arithmetic number, because the mean of its divisors is an integer number (12874818).

Almost surely, 2^66406907 is an apocalyptic number.

66406907 is a deficient number, since it is larger than the sum of its proper divisors (10842001).

66406907 is a wasteful number, since it uses less digits than its factorization.

66406907 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1355257 (or 1355250 counting only the distinct ones).

The product of its (nonzero) digits is 54432, while the sum is 38.

The square root of 66406907 is about 8149.0433180834. The cubic root of 66406907 is about 404.9528106376.

It can be divided in two parts, 66 and 406907, that multiplied together give a palindrome (26855862).

The spelling of 66406907 in words is "sixty-six million, four hundred six thousand, nine hundred seven".