66249763 has 8 divisors (see below), whose sum is σ = 67650800. Its totient is φ = 64862208.

The previous prime is 66249749. The next prime is 66249787. The reversal of 66249763 is 36794266.

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

It is a cyclic number.

It is not a de Polignac number, because 66249763 - 2⁹ = 66249251 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66249863) 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, 6883 + ... + 13411.

It is an arithmetic number, because the mean of its divisors is an integer number (8456350).

Almost surely, 2^66249763 is an apocalyptic number.

66249763 is a deficient number, since it is larger than the sum of its proper divisors (1401037).

66249763 is a wasteful number, since it uses less digits than its factorization.

66249763 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6741.

The product of its digits is 326592, while the sum is 43.

The square root of 66249763 is about 8139.3957392426. The cubic root of 66249763 is about 404.6331342212.

The spelling of 66249763 in words is "sixty-six million, two hundred forty-nine thousand, seven hundred sixty-three".