66109937965 has 16 divisors (see below), whose sum is σ = 79975019520. Its totient is φ = 52459600960.

The previous prime is 66109937963. The next prime is 66109937969. The reversal of 66109937965 is 56973990166.

It is not a de Polignac number, because 66109937965 - 2¹ = 66109937963 is a prime.

It is a super-2 number, since 2×66109937965² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66109937963) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1442676 + ... + 1487794.

It is an arithmetic number, because the mean of its divisors is an integer number (4998438720).

Almost surely, 2^66109937965 is an apocalyptic number.

It is an amenable number.

66109937965 is a deficient number, since it is larger than the sum of its proper divisors (13865081555).

66109937965 is a wasteful number, since it uses less digits than its factorization.

66109937965 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47492.

The product of its (nonzero) digits is 16533720, while the sum is 61.

The spelling of 66109937965 in words is "sixty-six billion, one hundred nine million, nine hundred thirty-seven thousand, nine hundred sixty-five".