66938607 has 6 divisors (see below), whose sum is σ = 96689112. Its totient is φ = 44625732.

The previous prime is 66938603. The next prime is 66938623. The reversal of 66938607 is 70683966.

66938607 is a `hidden beast` number, since 6 + 6 + 9 + 38 + 607 = 666.

It is not a de Polignac number, because 66938607 - 2² = 66938603 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66938603) 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, 3718803 + ... + 3718820.

It is an arithmetic number, because the mean of its divisors is an integer number (16114852).

Almost surely, 2^66938607 is an apocalyptic number.

66938607 is a deficient number, since it is larger than the sum of its proper divisors (29750505).

66938607 is a wasteful number, since it uses less digits than its factorization.

66938607 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7437629 (or 7437626 counting only the distinct ones).

The product of its (nonzero) digits is 326592, while the sum is 45.

The square root of 66938607 is about 8181.6017380462. The cubic root of 66938607 is about 406.0307170981.

The spelling of 66938607 in words is "sixty-six million, nine hundred thirty-eight thousand, six hundred seven".