66665431516 has 12 divisors (see below), whose sum is σ = 116681651632. Its totient is φ = 33327816768.

The previous prime is 66665431513. The next prime is 66665431561. The reversal of 66665431516 is 61513456666.

66665431516 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a hoax number, since the sum of its digits (49) coincides with the sum of the digits of its distinct prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 66665431516.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66665431513) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1194045 + ... + 1248628.

Almost surely, 2^66665431516 is an apocalyptic number.

It is an amenable number.

66665431516 is a deficient number, since it is larger than the sum of its proper divisors (50016220116).

66665431516 is a wasteful number, since it uses less digits than its factorization.

66665431516 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2449500 (or 2449498 counting only the distinct ones).

The product of its digits is 2332800, while the sum is 49.

The spelling of 66665431516 in words is "sixty-six billion, six hundred sixty-five million, four hundred thirty-one thousand, five hundred sixteen".