66453431 has 8 divisors (see below), whose sum is σ = 76310400. Its totient is φ = 57232440.

The previous prime is 66453421. The next prime is 66453449. The reversal of 66453431 is 13435466.

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 66453431 - 2¹⁴ = 66437047 is a prime.

It is a super-2 number, since 2×66453431² = 8832116983343522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66453421) 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, 158771 + ... + 159188.

It is an arithmetic number, because the mean of its divisors is an integer number (9538800).

Almost surely, 2^66453431 is an apocalyptic number.

66453431 is a deficient number, since it is larger than the sum of its proper divisors (9856969).

66453431 is a wasteful number, since it uses less digits than its factorization.

66453431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 317989.

The product of its digits is 25920, while the sum is 32.

The square root of 66453431 is about 8151.8973864984. The cubic root of 66453431 is about 405.0473571610.

Adding to 66453431 its reverse (13435466), we get a palindrome (79888897).

The spelling of 66453431 in words is "sixty-six million, four hundred fifty-three thousand, four hundred thirty-one".