6660404523 has 8 divisors (see below), whose sum is σ = 9867266000. Its totient is φ = 4440269664.

The previous prime is 6660404519. The next prime is 6660404537. The reversal of 6660404523 is 3254040666.

It is not a de Polignac number, because 6660404523 - 2² = 6660404519 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6660404123) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 123340798 + ... + 123340851.

It is an arithmetic number, because the mean of its divisors is an integer number (1233408250).

Almost surely, 2^6660404523 is an apocalyptic number.

6660404523 is a deficient number, since it is larger than the sum of its proper divisors (3206861477).

6660404523 is a wasteful number, since it uses less digits than its factorization.

6660404523 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 246681658 (or 246681652 counting only the distinct ones).

The product of its (nonzero) digits is 103680, while the sum is 36.

The square root of 6660404523 is about 81611.3014416508. The cubic root of 6660404523 is about 1881.4825828739.

The spelling of 6660404523 in words is "six billion, six hundred sixty million, four hundred four thousand, five hundred twenty-three".