667142563 has 4 divisors (see below), whose sum is σ = 670635648. Its totient is φ = 663649480.

The previous prime is 667142561. The next prime is 667142591. The reversal of 667142563 is 365241766.

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

It is a cyclic number.

It is not a de Polignac number, because 667142563 - 2¹ = 667142561 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (667142561) 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, 1746256 + ... + 1746637.

It is an arithmetic number, because the mean of its divisors is an integer number (167658912).

Almost surely, 2^667142563 is an apocalyptic number.

667142563 is a deficient number, since it is larger than the sum of its proper divisors (3493085).

667142563 is a wasteful number, since it uses less digits than its factorization.

667142563 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3493084.

The product of its digits is 181440, while the sum is 40.

The square root of 667142563 is about 25829.1030235275. The cubic root of 667142563 is about 873.7882821644.

The spelling of 667142563 in words is "six hundred sixty-seven million, one hundred forty-two thousand, five hundred sixty-three".