6600551001556 has 12 divisors (see below), whose sum is σ = 11564931567168. Its totient is φ = 3296284839512.

The previous prime is 6600551001533. The next prime is 6600551001601. The reversal of 6600551001556 is 6551001550066.

It is a super-2 number, since 2×6600551001556² (a number of 26 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 997661596 + ... + 997668211.

It is an arithmetic number, because the mean of its divisors is an integer number (963744297264).

Almost surely, 2^{6600551001556} is an apocalyptic number.

It is an amenable number.

6600551001556 is a deficient number, since it is larger than the sum of its proper divisors (4964380565612).

6600551001556 is a wasteful number, since it uses less digits than its factorization.

6600551001556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1995330638 (or 1995330636 counting only the distinct ones).

The product of its (nonzero) digits is 135000, while the sum is 40.

The spelling of 6600551001556 in words is "six trillion, six hundred billion, five hundred fifty-one million, one thousand, five hundred fifty-six".