6661404134 has 32 divisors (see below), whose sum is σ = 13190501376. Its totient is φ = 2442683520.

The previous prime is 6661404077. The next prime is 6661404137. The reversal of 6661404134 is 4314041666.

It is a happy number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 6661404094 and 6661404103.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6661404137) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1269614 + ... + 1274849.

It is an arithmetic number, because the mean of its divisors is an integer number (412203168).

Almost surely, 2^6661404134 is an apocalyptic number.

6661404134 is a deficient number, since it is larger than the sum of its proper divisors (6529097242).

6661404134 is a wasteful number, since it uses less digits than its factorization.

6661404134 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2544500.

The product of its (nonzero) digits is 41472, while the sum is 35.

The square root of 6661404134 is about 81617.4254310928. The cubic root of 6661404134 is about 1881.5767041142.

The spelling of 6661404134 in words is "six billion, six hundred sixty-one million, four hundred four thousand, one hundred thirty-four".