66339031 has 4 divisors (see below), whose sum is σ = 72369864. Its totient is φ = 60308200.

The previous prime is 66339029. The next prime is 66339059. The reversal of 66339031 is 13093366.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 66339031 - 2¹ = 66339029 is a prime.

It is a super-2 number, since 2×66339031² = 8801734068037922, 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 = 66338984 and 66339002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66339071) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3015400 + ... + 3015421.

It is an arithmetic number, because the mean of its divisors is an integer number (18092466).

Almost surely, 2^66339031 is an apocalyptic number.

66339031 is the 3643-rd centered decagonal number.

66339031 is a deficient number, since it is larger than the sum of its proper divisors (6030833).

66339031 is a wasteful number, since it uses less digits than its factorization.

66339031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6030832.

The product of its (nonzero) digits is 8748, while the sum is 31.

The square root of 66339031 is about 8144.8775926959. The cubic root of 66339031 is about 404.8147931310.

The spelling of 66339031 in words is "sixty-six million, three hundred thirty-nine thousand, thirty-one".