6721012551 has 16 divisors (see below), whose sum is σ = 10201063680. Its totient is φ = 3896238720.

The previous prime is 6721012523. The next prime is 6721012561. The reversal of 6721012551 is 1552101276.

It is not a de Polignac number, because 6721012551 - 2¹⁰ = 6721011527 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6721012511) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4426786 + ... + 4428303.

It is an arithmetic number, because the mean of its divisors is an integer number (637566480).

Almost surely, 2^6721012551 is an apocalyptic number.

6721012551 is a deficient number, since it is larger than the sum of its proper divisors (3480051129).

6721012551 is a wasteful number, since it uses less digits than its factorization.

6721012551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8855126.

The product of its (nonzero) digits is 4200, while the sum is 30.

The square root of 6721012551 is about 81981.7818237686. The cubic root of 6721012551 is about 1887.1723672428.

The spelling of 6721012551 in words is "six billion, seven hundred twenty-one million, twelve thousand, five hundred fifty-one".