66777702174457 has 4 divisors (see below), whose sum is σ = 66777721830016. Its totient is φ = 66777682518900.

The previous prime is 66777702174413. The next prime is 66777702174467. The reversal of 66777702174457 is 75447120777766.

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 66777702174457 - 2⁷ = 66777702174329 is a prime.

It is a super-3 number, since 3×66777702174457³ (a number of 42 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66777702174467) 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, 3275553 + ... + 12011854.

It is an arithmetic number, because the mean of its divisors is an integer number (16694430457504).

Almost surely, 2^{66777702174457} is an apocalyptic number.

It is an amenable number.

66777702174457 is a deficient number, since it is larger than the sum of its proper divisors (19655559).

66777702174457 is a wasteful number, since it uses less digits than its factorization.

66777702174457 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19655558.

The product of its (nonzero) digits is 677658240, while the sum is 70.

The spelling of 66777702174457 in words is "sixty-six trillion, seven hundred seventy-seven billion, seven hundred two million, one hundred seventy-four thousand, four hundred fifty-seven".