66506607 has 6 divisors (see below), whose sum is σ = 96065112. Its totient is φ = 44337732.

The previous prime is 66506603. The next prime is 66506611. The reversal of 66506607 is 70660566.

It is an interprime number because it is at equal distance from previous prime (66506603) and next prime (66506611).

It is not a de Polignac number, because 66506607 - 2² = 66506603 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66506603) 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, 3694803 + ... + 3694820.

It is an arithmetic number, because the mean of its divisors is an integer number (16010852).

Almost surely, 2^66506607 is an apocalyptic number.

66506607 is a deficient number, since it is larger than the sum of its proper divisors (29558505).

66506607 is a wasteful number, since it uses less digits than its factorization.

66506607 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7389629 (or 7389626 counting only the distinct ones).

The product of its (nonzero) digits is 45360, while the sum is 36.

The square root of 66506607 is about 8155.1583062501. The cubic root of 66506607 is about 405.1553679157.

The spelling of 66506607 in words is "sixty-six million, five hundred six thousand, six hundred seven".