6661867497 has 4 divisors (see below), whose sum is σ = 8882490000. Its totient is φ = 4441244996.

The previous prime is 6661867483. The next prime is 6661867517. The reversal of 6661867497 is 7947681666.

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 6661867497 - 2⁷ = 6661867369 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 6661867497.

It is not an unprimeable number, because it can be changed into a prime (6661867447) 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, 1110311247 + ... + 1110311252.

It is an arithmetic number, because the mean of its divisors is an integer number (2220622500).

Almost surely, 2^6661867497 is an apocalyptic number.

It is an amenable number.

6661867497 is a deficient number, since it is larger than the sum of its proper divisors (2220622503).

6661867497 is a wasteful number, since it uses less digits than its factorization.

6661867497 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2220622502.

The product of its digits is 18289152, while the sum is 60.

The square root of 6661867497 is about 81620.2640096196. The cubic root of 6661867497 is about 1881.6203301923.

The spelling of 6661867497 in words is "six billion, six hundred sixty-one million, eight hundred sixty-seven thousand, four hundred ninety-seven".