66044891731 has 8 divisors (see below), whose sum is σ = 81286020704. Its totient is φ = 52255298880.

The previous prime is 66044891729. The next prime is 66044891741. The reversal of 66044891731 is 13719844066.

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 66044891731 - 2¹ = 66044891729 is a prime.

It is a super-2 number, since 2×66044891731² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (66044891741) 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, 362883930 + ... + 362884111.

It is an arithmetic number, because the mean of its divisors is an integer number (10160752588).

Almost surely, 2^66044891731 is an apocalyptic number.

66044891731 is a deficient number, since it is larger than the sum of its proper divisors (15241128973).

66044891731 is a wasteful number, since it uses less digits than its factorization.

66044891731 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 725768061.

The product of its (nonzero) digits is 870912, while the sum is 49.

The spelling of 66044891731 in words is "sixty-six billion, forty-four million, eight hundred ninety-one thousand, seven hundred thirty-one".