6515419987 has 2 divisors, whose sum is σ = 6515419988. Its totient is φ = 6515419986.

The previous prime is 6515419969. The next prime is 6515419991. The reversal of 6515419987 is 7899145156.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6515419987 is a prime.

It is not a weakly prime, because it can be changed into another prime (6515419907) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3257709993 + 3257709994.

It is an arithmetic number, because the mean of its divisors is an integer number (3257709994).

Almost surely, 2^6515419987 is an apocalyptic number.

6515419987 is a deficient number, since it is larger than the sum of its proper divisors (1).

6515419987 is an equidigital number, since it uses as much as digits as its factorization.

6515419987 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2721600, while the sum is 55.

The square root of 6515419987 is about 80718.1515335925. The cubic root of 6515419987 is about 1867.7301891908.

The spelling of 6515419987 in words is "six billion, five hundred fifteen million, four hundred nineteen thousand, nine hundred eighty-seven".