6662401786 has 8 divisors (see below), whose sum is σ = 10009801620. Its totient is φ = 3325801248.

The previous prime is 6662401771. The next prime is 6662401787. The reversal of 6662401786 is 6871042666.

It can be written as a sum of positive squares in 2 ways, for example, as 6341096161 + 321305625 = 79631^2 + 17925^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (6662401787) 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, 2698281 + ... + 2700748.

Almost surely, 2^6662401786 is an apocalyptic number.

6662401786 is a deficient number, since it is larger than the sum of its proper divisors (3347399834).

6662401786 is a wasteful number, since it uses less digits than its factorization.

6662401786 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5399648.

The product of its (nonzero) digits is 580608, while the sum is 46.

The square root of 6662401786 is about 81623.5369608546. The cubic root of 6662401786 is about 1881.6706315115.

The spelling of 6662401786 in words is "six billion, six hundred sixty-two million, four hundred one thousand, seven hundred eighty-six".