6721567487 has 2 divisors, whose sum is σ = 6721567488. Its totient is φ = 6721567486.

The previous prime is 6721567439. The next prime is 6721567499. The reversal of 6721567487 is 7847651276.

It is a happy number.

6721567487 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 6721567487 - 2¹⁶ = 6721501951 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6721567417) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3360783743 + 3360783744.

It is an arithmetic number, because the mean of its divisors is an integer number (3360783744).

Almost surely, 2^6721567487 is an apocalyptic number.

6721567487 is a deficient number, since it is larger than the sum of its proper divisors (1).

6721567487 is an equidigital number, since it uses as much as digits as its factorization.

6721567487 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3951360, while the sum is 53.

The square root of 6721567487 is about 81985.1662619525. The cubic root of 6721567487 is about 1887.2243054021.

The spelling of 6721567487 in words is "six billion, seven hundred twenty-one million, five hundred sixty-seven thousand, four hundred eighty-seven".