6531155551 has 8 divisors (see below), whose sum is σ = 6876731520. Its totient is φ = 6185762712.

The previous prime is 6531155537. The next prime is 6531155593. The reversal of 6531155551 is 1555511356.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6531155551 is a prime.

It is a super-2 number, since 2×6531155551² = 85311985662716227202, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 6531155551.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6531155651) 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, 30726 + ... + 118348.

It is an arithmetic number, because the mean of its divisors is an integer number (859591440).

Almost surely, 2^6531155551 is an apocalyptic number.

6531155551 is a deficient number, since it is larger than the sum of its proper divisors (345575969).

6531155551 is a wasteful number, since it uses less digits than its factorization.

6531155551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 91565.

The product of its digits is 56250, while the sum is 37.

The square root of 6531155551 is about 80815.5650292690. The cubic root of 6531155551 is about 1869.2325819585.

The spelling of 6531155551 in words is "six billion, five hundred thirty-one million, one hundred fifty-five thousand, five hundred fifty-one".