66340431 has 16 divisors (see below), whose sum is σ = 98784000. Its totient is φ = 44001144.

The previous prime is 66340411. The next prime is 66340433. The reversal of 66340431 is 13404366.

It is not a de Polignac number, because 66340431 - 2⁵ = 66340399 is a prime.

It is a super-2 number, since 2×66340431² = 8802105570531522, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a junction number, because it is equal to n+sod(n) for n = 66340395 and 66340404.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66340433) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 801 + ... + 11546.

It is an arithmetic number, because the mean of its divisors is an integer number (6174000).

Almost surely, 2^66340431 is an apocalyptic number.

66340431 is a deficient number, since it is larger than the sum of its proper divisors (32443569).

66340431 is a wasteful number, since it uses less digits than its factorization.

66340431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12555 (or 12549 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 27.

The square root of 66340431 is about 8144.9635358300. The cubic root of 66340431 is about 404.8176408096.

Adding to 66340431 its reverse (13404366), we get a palindrome (79744797).

The spelling of 66340431 in words is "sixty-six million, three hundred forty thousand, four hundred thirty-one".