666739359851 has 4 divisors (see below), whose sum is σ = 666917970432. Its totient is φ = 666560749272.

The previous prime is 666739359829. The next prime is 666739359857. The reversal of 666739359851 is 158953937666.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 158953937666 = 2 ⋅79476968833.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-666739359851 is a prime.

It is a super-3 number, since 3×666739359851³ (a number of 36 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (666739359857) 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 3 ways as a sum of consecutive naturals, for example, 89299691 + ... + 89307156.

It is an arithmetic number, because the mean of its divisors is an integer number (166729492608).

Almost surely, 2^666739359851 is an apocalyptic number.

666739359851 is a deficient number, since it is larger than the sum of its proper divisors (178610581).

666739359851 is a wasteful number, since it uses less digits than its factorization.

666739359851 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 178610580.

The product of its digits is 220449600, while the sum is 68.

The spelling of 666739359851 in words is "six hundred sixty-six billion, seven hundred thirty-nine million, three hundred fifty-nine thousand, eight hundred fifty-one".