66903693 has 8 divisors (see below), whose sum is σ = 93900000. Its totient is φ = 42254928.

The previous prime is 66903691. The next prime is 66903709. The reversal of 66903693 is 39630966.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 66903693 - 2¹ = 66903691 is a prime.

It is a super-2 number, since 2×66903693² = 8952208274076498, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66903691) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 586818 + ... + 586931.

It is an arithmetic number, because the mean of its divisors is an integer number (11737500).

Almost surely, 2^66903693 is an apocalyptic number.

It is an amenable number.

66903693 is a deficient number, since it is larger than the sum of its proper divisors (26996307).

66903693 is a wasteful number, since it uses less digits than its factorization.

66903693 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1173771.

The product of its (nonzero) digits is 157464, while the sum is 42.

The square root of 66903693 is about 8179.4677699713. The cubic root of 66903693 is about 405.9601119945.

The spelling of 66903693 in words is "sixty-six million, nine hundred three thousand, six hundred ninety-three".