66912372619 has 4 divisors (see below), whose sum is σ = 67036055920. Its totient is φ = 66788689320.

The previous prime is 66912372551. The next prime is 66912372671. The reversal of 66912372619 is 91627321966.

It is a happy number.

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 66912372619 - 2¹¹ = 66912370571 is a prime.

It is a super-2 number, since 2×66912372619² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66912372689) 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, 61840839 + ... + 61841920.

It is an arithmetic number, because the mean of its divisors is an integer number (16759013980).

Almost surely, 2^66912372619 is an apocalyptic number.

66912372619 is a deficient number, since it is larger than the sum of its proper divisors (123683301).

66912372619 is a wasteful number, since it uses less digits than its factorization.

66912372619 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 123683300.

The product of its digits is 1469664, while the sum is 52.

The spelling of 66912372619 in words is "sixty-six billion, nine hundred twelve million, three hundred seventy-two thousand, six hundred nineteen".