6660551615 has 8 divisors (see below), whose sum is σ = 7998803808. Its totient is φ = 5324346720.

The previous prime is 6660551591. The next prime is 6660551617. The reversal of 6660551615 is 5161550666.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 6660551615 - 2³⁰ = 5586809791 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6660551617) 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, 504656 + ... + 517685.

It is an arithmetic number, because the mean of its divisors is an integer number (999850476).

Almost surely, 2^6660551615 is an apocalyptic number.

6660551615 is a deficient number, since it is larger than the sum of its proper divisors (1338252193).

6660551615 is a wasteful number, since it uses less digits than its factorization.

6660551615 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1023649.

The product of its (nonzero) digits is 162000, while the sum is 41.

The square root of 6660551615 is about 81612.2026108841. The cubic root of 6660551615 is about 1881.4964333338.

The spelling of 6660551615 in words is "six billion, six hundred sixty million, five hundred fifty-one thousand, six hundred fifteen".