6661510054 has 4 divisors (see below), whose sum is σ = 9992265084. Its totient is φ = 3330755026.

The previous prime is 6661510019. The next prime is 6661510069. The reversal of 6661510054 is 4500151666.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1665377512 + ... + 1665377515.

It is an arithmetic number, because the mean of its divisors is an integer number (2498066271).

Almost surely, 2^6661510054 is an apocalyptic number.

6661510054 is a deficient number, since it is larger than the sum of its proper divisors (3330755030).

6661510054 is a wasteful number, since it uses less digits than its factorization.

6661510054 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3330755029.

The product of its (nonzero) digits is 21600, while the sum is 34.

The square root of 6661510054 is about 81618.0743095547. The cubic root of 6661510054 is about 1881.5866767638.

The spelling of 6661510054 in words is "six billion, six hundred sixty-one million, five hundred ten thousand, fifty-four".