6561270787 has 2 divisors, whose sum is σ = 6561270788. Its totient is φ = 6561270786.

The previous prime is 6561270763. The next prime is 6561270811. The reversal of 6561270787 is 7870721656.

It is a happy number.

It is a balanced prime because it is at equal distance from previous prime (6561270763) and next prime (6561270811).

It is a cyclic number.

It is not a de Polignac number, because 6561270787 - 2⁷ = 6561270659 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a self number, because there is not a number n which added to its sum of digits gives 6561270787.

It is not a weakly prime, because it can be changed into another prime (6561270707) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3280635393 + 3280635394.

It is an arithmetic number, because the mean of its divisors is an integer number (3280635394).

Almost surely, 2^6561270787 is an apocalyptic number.

6561270787 is a deficient number, since it is larger than the sum of its proper divisors (1).

6561270787 is an equidigital number, since it uses as much as digits as its factorization.

6561270787 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 987840, while the sum is 49.

The square root of 6561270787 is about 81001.6715074448. The cubic root of 6561270787 is about 1872.1011952922.

The spelling of 6561270787 in words is "six billion, five hundred sixty-one million, two hundred seventy thousand, seven hundred eighty-seven".