66654349379 has 2 divisors, whose sum is σ = 66654349380. Its totient is φ = 66654349378.

The previous prime is 66654349357. The next prime is 66654349441. The reversal of 66654349379 is 97394345666.

It is an a-pointer prime, because the next prime (66654349441) can be obtained adding 66654349379 to its sum of digits (62).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 66654349379 - 2⁸ = 66654349123 is a prime.

It is a super-2 number, since 2×66654349379² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (66654349319) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33327174689 + 33327174690.

It is an arithmetic number, because the mean of its divisors is an integer number (33327174690).

Almost surely, 2^66654349379 is an apocalyptic number.

66654349379 is a deficient number, since it is larger than the sum of its proper divisors (1).

66654349379 is an equidigital number, since it uses as much as digits as its factorization.

66654349379 is an evil number, because the sum of its binary digits is even.

The product of its digits is 88179840, while the sum is 62.

The spelling of 66654349379 in words is "sixty-six billion, six hundred fifty-four million, three hundred forty-nine thousand, three hundred seventy-nine".