6667018981 has 4 divisors (see below), whose sum is σ = 7619450272. Its totient is φ = 5714587692.

The previous prime is 6667018931. The next prime is 6667018987. The reversal of 6667018981 is 1898107666.

It is a happy number.

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 6667018981 - 2¹³ = 6667010789 is a prime.

It is a super-2 number, since 2×6667018981² = 88898284186028556722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6667018987) 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, 476215635 + ... + 476215648.

It is an arithmetic number, because the mean of its divisors is an integer number (1904862568).

Almost surely, 2^6667018981 is an apocalyptic number.

It is an amenable number.

6667018981 is a deficient number, since it is larger than the sum of its proper divisors (952431291).

6667018981 is an equidigital number, since it uses as much as digits as its factorization.

6667018981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 952431290.

The product of its (nonzero) digits is 870912, while the sum is 52.

The square root of 6667018981 is about 81651.8155401336. The cubic root of 6667018981 is about 1882.1052112262.

The spelling of 6667018981 in words is "six billion, six hundred sixty-seven million, eighteen thousand, nine hundred eighty-one".