667701778033 has 4 divisors (see below), whose sum is σ = 670866241648. Its totient is φ = 664537314420.

The previous prime is 667701777973. The next prime is 667701778097. The reversal of 667701778033 is 330877107766.

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 667701778033 - 2¹⁷ = 667701646961 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (667701775033) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1582231491 + ... + 1582231912.

It is an arithmetic number, because the mean of its divisors is an integer number (167716560412).

Almost surely, 2^667701778033 is an apocalyptic number.

It is an amenable number.

667701778033 is a deficient number, since it is larger than the sum of its proper divisors (3164463615).

667701778033 is a wasteful number, since it uses less digits than its factorization.

667701778033 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3164463614.

The product of its (nonzero) digits is 6223392, while the sum is 55.

The spelling of 667701778033 in words is "six hundred sixty-seven billion, seven hundred one million, seven hundred seventy-eight thousand, thirty-three".