66393431 has 8 divisors (see below), whose sum is σ = 71730624. Its totient is φ = 61089120.

The previous prime is 66393409. The next prime is 66393463. The reversal of 66393431 is 13439366.

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 66393431 - 2⁶ = 66393367 is a prime.

It is a super-2 number, since 2×66393431² = 8816175359903522, 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 = 66393391 and 66393400.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66393031) 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, 3935 + ... + 12176.

It is an arithmetic number, because the mean of its divisors is an integer number (8966328).

Almost surely, 2^66393431 is an apocalyptic number.

66393431 is a deficient number, since it is larger than the sum of its proper divisors (5337193).

66393431 is a wasteful number, since it uses less digits than its factorization.

66393431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16441.

The product of its digits is 34992, while the sum is 35.

The square root of 66393431 is about 8148.2164306061. The cubic root of 66393431 is about 404.9254163323.

The spelling of 66393431 in words is "sixty-six million, three hundred ninety-three thousand, four hundred thirty-one".