6661506574 has 4 divisors (see below), whose sum is σ = 9992259864. Its totient is φ = 3330753286.

The previous prime is 6661506547. The next prime is 6661506589. The reversal of 6661506574 is 4756051666.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 4756051666 = 2 ⋅2378025833.

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, 1665376642 + ... + 1665376645.

It is an arithmetic number, because the mean of its divisors is an integer number (2498064966).

Almost surely, 2^6661506574 is an apocalyptic number.

6661506574 is a deficient number, since it is larger than the sum of its proper divisors (3330753290).

6661506574 is a wasteful number, since it uses less digits than its factorization.

6661506574 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3330753289.

The product of its (nonzero) digits is 907200, while the sum is 46.

The square root of 6661506574 is about 81618.0529907446. The cubic root of 6661506574 is about 1881.5863491142.

The spelling of 6661506574 in words is "six billion, six hundred sixty-one million, five hundred six thousand, five hundred seventy-four".