65666963631 has 8 divisors (see below), whose sum is σ = 88755348400. Its totient is φ = 43178277312.

The previous prime is 65666963629. The next prime is 65666963641. The reversal of 65666963631 is 13636966656.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 65666963631 - 2¹ = 65666963629 is a prime.

It is a super-2 number, since 2×65666963631² (a number of 22 digits) 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 (65666963641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 149924356 + ... + 149924793.

It is an arithmetic number, because the mean of its divisors is an integer number (11094418550).

Almost surely, 2^65666963631 is an apocalyptic number.

65666963631 is a deficient number, since it is larger than the sum of its proper divisors (23088384769).

65666963631 is a wasteful number, since it uses less digits than its factorization.

65666963631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 299849225.

The product of its digits is 18895680, while the sum is 57.

The spelling of 65666963631 in words is "sixty-five billion, six hundred sixty-six million, nine hundred sixty-three thousand, six hundred thirty-one".