66319408511 has 4 divisors (see below), whose sum is σ = 66432389352. Its totient is φ = 66206427672.

The previous prime is 66319408483. The next prime is 66319408513. The reversal of 66319408511 is 11580491366.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 66319408511 - 2¹⁰ = 66319407487 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66319408513) 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, 56489540 + ... + 56490713.

It is an arithmetic number, because the mean of its divisors is an integer number (16608097338).

Almost surely, 2^66319408511 is an apocalyptic number.

66319408511 is a deficient number, since it is larger than the sum of its proper divisors (112980841).

66319408511 is a wasteful number, since it uses less digits than its factorization.

66319408511 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 112980840.

The product of its (nonzero) digits is 155520, while the sum is 44.

Adding to 66319408511 its reverse (11580491366), we get a palindrome (77899899877).

The spelling of 66319408511 in words is "sixty-six billion, three hundred nineteen million, four hundred eight thousand, five hundred eleven".