66560431 has 16 divisors (see below), whose sum is σ = 78236928. Its totient is φ = 55440000.

The previous prime is 66560419. The next prime is 66560449. The reversal of 66560431 is 13406566.

It is not a de Polignac number, because 66560431 - 2⁹ = 66559919 is a prime.

It is a super-2 number, since 2×66560431² = 8860581949811522, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 66560393 and 66560402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66560471) 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, 75111 + ... + 75991.

It is an arithmetic number, because the mean of its divisors is an integer number (4889808).

Almost surely, 2^66560431 is an apocalyptic number.

66560431 is a deficient number, since it is larger than the sum of its proper divisors (11676497).

66560431 is a wasteful number, since it uses less digits than its factorization.

66560431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1182.

The product of its (nonzero) digits is 12960, while the sum is 31.

The square root of 66560431 is about 8158.4576360976. The cubic root of 66560431 is about 405.2646362692.

Adding to 66560431 its reverse (13406566), we get a palindrome (79966997).

The spelling of 66560431 in words is "sixty-six million, five hundred sixty thousand, four hundred thirty-one".