6661065431 has 2 divisors, whose sum is σ = 6661065432. Its totient is φ = 6661065430.

The previous prime is 6661065427. The next prime is 6661065469. The reversal of 6661065431 is 1345601666.

It is an a-pointer prime, because the next prime (6661065469) can be obtained adding 6661065431 to its sum of digits (38).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 6661065431 - 2² = 6661065427 is a prime.

It is a super-2 number, since 2×6661065431² = 88739585352126431522, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6661065421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3330532715 + 3330532716.

It is an arithmetic number, because the mean of its divisors is an integer number (3330532716).

Almost surely, 2^6661065431 is an apocalyptic number.

6661065431 is a deficient number, since it is larger than the sum of its proper divisors (1).

6661065431 is an equidigital number, since it uses as much as digits as its factorization.

6661065431 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 77760, while the sum is 38.

The square root of 6661065431 is about 81615.3504617851. The cubic root of 6661065431 is about 1881.5448136167.

The spelling of 6661065431 in words is "six billion, six hundred sixty-one million, sixty-five thousand, four hundred thirty-one".