66903723 has 6 divisors (see below), whose sum is σ = 96638724. Its totient is φ = 44602476.

The previous prime is 66903709. The next prime is 66903779. The reversal of 66903723 is 32730966.

It is not a de Polignac number, because 66903723 - 2⁵ = 66903691 is a prime.

It is a super-2 number, since 2×66903723² = 8952216302521458, which contains 22 as substring.

It is a zygodrome in base 3.

It is not an unprimeable number, because it can be changed into a prime (66903223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3716865 + ... + 3716882.

It is an arithmetic number, because the mean of its divisors is an integer number (16106454).

Almost surely, 2^66903723 is an apocalyptic number.

66903723 is a deficient number, since it is larger than the sum of its proper divisors (29735001).

66903723 is a wasteful number, since it uses less digits than its factorization.

66903723 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7433753 (or 7433750 counting only the distinct ones).

The product of its (nonzero) digits is 40824, while the sum is 36.

The square root of 66903723 is about 8179.4696038313. The cubic root of 66903723 is about 405.9601726727.

The spelling of 66903723 in words is "sixty-six million, nine hundred three thousand, seven hundred twenty-three".