66121057349 has 4 divisors (see below), whose sum is σ = 66739011264. Its totient is φ = 65503103436.

The previous prime is 66121057283. The next prime is 66121057399. The reversal of 66121057349 is 94375012166.

66121057349 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 66121057349 - 2²⁸ = 65852621893 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66121057399) 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, 308976797 + ... + 308977010.

It is an arithmetic number, because the mean of its divisors is an integer number (16684752816).

Almost surely, 2^66121057349 is an apocalyptic number.

It is an amenable number.

66121057349 is a deficient number, since it is larger than the sum of its proper divisors (617953915).

66121057349 is a wasteful number, since it uses less digits than its factorization.

66121057349 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 617953914.

The product of its (nonzero) digits is 272160, while the sum is 44.

The spelling of 66121057349 in words is "sixty-six billion, one hundred twenty-one million, fifty-seven thousand, three hundred forty-nine".