667072771231 has 4 divisors (see below), whose sum is σ = 683342838864. Its totient is φ = 650802703600.

The previous prime is 667072771219. The next prime is 667072771247. The reversal of 667072771231 is 132177270766.

667072771231 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 an emirpimes, since its reverse is a distinct semiprime: 132177270766 = 2 ⋅66088635383.

It is a cyclic number.

It is not a de Polignac number, because 667072771231 - 2¹⁵ = 667072738463 is a prime.

It is a super-2 number, since 2×667072771231² (a number of 24 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (667072771201) 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, 8135033755 + ... + 8135033836.

It is an arithmetic number, because the mean of its divisors is an integer number (170835709716).

Almost surely, 2^667072771231 is an apocalyptic number.

667072771231 is a deficient number, since it is larger than the sum of its proper divisors (16270067633).

667072771231 is a wasteful number, since it uses less digits than its factorization.

667072771231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16270067632.

The product of its (nonzero) digits is 1037232, while the sum is 49.

The spelling of 667072771231 in words is "six hundred sixty-seven billion, seventy-two million, seven hundred seventy-one thousand, two hundred thirty-one".