667765055 has 4 divisors (see below), whose sum is σ = 801318072. Its totient is φ = 534212040.

The previous prime is 667764971. The next prime is 667765057. The reversal of 667765055 is 550567766.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 667765055 - 2¹⁸ = 667502911 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (667765057) 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, 66776501 + ... + 66776510.

It is an arithmetic number, because the mean of its divisors is an integer number (200329518).

Almost surely, 2^667765055 is an apocalyptic number.

667765055 is a deficient number, since it is larger than the sum of its proper divisors (133553017).

667765055 is a wasteful number, since it uses less digits than its factorization.

667765055 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 133553016.

The product of its (nonzero) digits is 1323000, while the sum is 47.

The square root of 667765055 is about 25841.1504194376. The cubic root of 667765055 is about 874.0599667883.

The spelling of 667765055 in words is "six hundred sixty-seven million, seven hundred sixty-five thousand, fifty-five".