66923505 has 48 divisors (see below), whose sum is σ = 127236096. Its totient is φ = 32271360.

The previous prime is 66923489. The next prime is 66923533. The reversal of 66923505 is 50532966.

66923505 is a `hidden beast` number, since 66 + 92 + 3 + 505 = 666.

It is not a de Polignac number, because 66923505 - 2⁴ = 66923489 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 66923505.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 174544 + ... + 174926.

It is an arithmetic number, because the mean of its divisors is an integer number (2650752).

Almost surely, 2^66923505 is an apocalyptic number.

It is an amenable number.

66923505 is a deficient number, since it is larger than the sum of its proper divisors (60312591).

66923505 is a wasteful number, since it uses less digits than its factorization.

66923505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 758 (or 755 counting only the distinct ones).

The product of its (nonzero) digits is 48600, while the sum is 36.

The square root of 66923505 is about 8180.6787615698. The cubic root of 66923505 is about 406.0001799768. Note that the first 3 decimals are identical.

The spelling of 66923505 in words is "sixty-six million, nine hundred twenty-three thousand, five hundred five".