667077728257 has 4 divisors (see below), whose sum is σ = 667203526080. Its totient is φ = 666951930436.

The previous prime is 667077728227. The next prime is 667077728309. The reversal of 667077728257 is 752827770766.

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, and also an emirpimes, since its reverse is a distinct semiprime: 752827770766 = 2 ⋅376413885383.

It is a cyclic number.

It is not a de Polignac number, because 667077728257 - 2⁷ = 667077728129 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (667077728227) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 62890957 + ... + 62901562.

It is an arithmetic number, because the mean of its divisors is an integer number (166800881520).

Almost surely, 2^667077728257 is an apocalyptic number.

It is an amenable number.

667077728257 is a deficient number, since it is larger than the sum of its proper divisors (125797823).

667077728257 is a wasteful number, since it uses less digits than its factorization.

667077728257 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 125797822.

The product of its (nonzero) digits is 96808320, while the sum is 64.

The spelling of 667077728257 in words is "six hundred sixty-seven billion, seventy-seven million, seven hundred twenty-eight thousand, two hundred fifty-seven".