66664161535 has 4 divisors (see below), whose sum is σ = 79996993848. Its totient is φ = 53331329224.

The previous prime is 66664161461. The next prime is 66664161559. The reversal of 66664161535 is 53516146666.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 53516146666 = 2 ⋅26758073333.

It is a cyclic number.

It is not a de Polignac number, because 66664161535 - 2⁷ = 66664161407 is a prime.

It is a super-2 number, since 2×66664161535² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6666416149 + ... + 6666416158.

It is an arithmetic number, because the mean of its divisors is an integer number (19999248462).

Almost surely, 2^66664161535 is an apocalyptic number.

66664161535 is a deficient number, since it is larger than the sum of its proper divisors (13332832313).

66664161535 is a wasteful number, since it uses less digits than its factorization.

66664161535 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13332832312.

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

The spelling of 66664161535 in words is "sixty-six billion, six hundred sixty-four million, one hundred sixty-one thousand, five hundred thirty-five".