66247031 has 8 divisors (see below), whose sum is σ = 69210624. Its totient is φ = 63335160.

The previous prime is 66247019. The next prime is 66247033. The reversal of 66247031 is 13074266.

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 66247031 - 2¹⁰ = 66246007 is a prime.

It is a super-2 number, since 2×66247031² = 8777338232629922, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 66246985 and 66247003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66247033) 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, 10301 + ... + 15446.

It is an arithmetic number, because the mean of its divisors is an integer number (8651328).

Almost surely, 2^66247031 is an apocalyptic number.

66247031 is a deficient number, since it is larger than the sum of its proper divisors (2963593).

66247031 is a wasteful number, since it uses less digits than its factorization.

66247031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25861.

The product of its (nonzero) digits is 6048, while the sum is 29.

The square root of 66247031 is about 8139.2279117862. The cubic root of 66247031 is about 404.6275720735.

The spelling of 66247031 in words is "sixty-six million, two hundred forty-seven thousand, thirty-one".