6663690418 has 24 divisors (see below), whose sum is σ = 12684503664. Its totient is φ = 2596242600.

The previous prime is 6663690403. The next prime is 6663690419. The reversal of 6663690418 is 8140963666.

It is a Harshad number since it is a multiple of its sum of digits (49).

It is not an unprimeable number, because it can be changed into a prime (6663690419) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3089688 + ... + 3091843.

It is an arithmetic number, because the mean of its divisors is an integer number (528520986).

Almost surely, 2^6663690418 is an apocalyptic number.

6663690418 is a deficient number, since it is larger than the sum of its proper divisors (6020813246).

6663690418 is a wasteful number, since it uses less digits than its factorization.

6663690418 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6181558 (or 6181551 counting only the distinct ones).

The product of its (nonzero) digits is 1119744, while the sum is 49.

The square root of 6663690418 is about 81631.4303317050. The cubic root of 6663690418 is about 1881.7919403503.

The spelling of 6663690418 in words is "six billion, six hundred sixty-three million, six hundred ninety thousand, four hundred eighteen".