861872270647 has 2 divisors, whose sum is σ = 861872270648. Its totient is φ = 861872270646.

The previous prime is 861872270627. The next prime is 861872270669. The reversal of 861872270647 is 746072278168.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 861872270647 - 2³⁵ = 827512532279 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 861872270591 and 861872270600.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (861872270617) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 430936135323 + 430936135324.

It is an arithmetic number, because the mean of its divisors is an integer number (430936135324).

Almost surely, 2^861872270647 is an apocalyptic number.

861872270647 is a deficient number, since it is larger than the sum of its proper divisors (1).

861872270647 is an equidigital number, since it uses as much as digits as its factorization.

861872270647 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12644352, while the sum is 58.

The spelling of 861872270647 in words is "eight hundred sixty-one billion, eight hundred seventy-two million, two hundred seventy thousand, six hundred forty-seven".