66732913 has 16 divisors (see below), whose sum is σ = 75922560. Its totient is φ = 58189824.

The previous prime is 66732907. The next prime is 66732929. The reversal of 66732913 is 31923766.

It is a cyclic number.

It is not a de Polignac number, because 66732913 - 2⁵ = 66732881 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66732943) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 23473 + ... + 26161.

It is an arithmetic number, because the mean of its divisors is an integer number (4745160).

Almost surely, 2^66732913 is an apocalyptic number.

It is an amenable number.

66732913 is a deficient number, since it is larger than the sum of its proper divisors (9189647).

66732913 is a wasteful number, since it uses less digits than its factorization.

66732913 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2808.

The product of its digits is 40824, while the sum is 37.

The square root of 66732913 is about 8169.0215448363. The cubic root of 66732913 is about 405.6143964360.

The spelling of 66732913 in words is "sixty-six million, seven hundred thirty-two thousand, nine hundred thirteen".