872187352680649 has 2 divisors, whose sum is σ = 872187352680650. Its totient is φ = 872187352680648.

The previous prime is 872187352680599. The next prime is 872187352680713. The reversal of 872187352680649 is 946086253781278.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 457140447390649 + 415046905290000 = 21380843^2 + 20372700^2 .

It is a cyclic number.

It is not a de Polignac number, because 872187352680649 - 2¹³ = 872187352672457 is a prime.

It is a super-2 number, since 2×872187352680649² (a number of 31 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (872187352689649) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 436093676340324 + 436093676340325.

It is an arithmetic number, because the mean of its divisors is an integer number (436093676340325).

It is a 2-persistent number, because it is pandigital, and so is 2⋅872187352680649 = 1744374705361298, but 3⋅872187352680649 = 2616562058041947 is not.

Almost surely, 2^{872187352680649} is an apocalyptic number.

It is an amenable number.

872187352680649 is a deficient number, since it is larger than the sum of its proper divisors (1).

872187352680649 is an equidigital number, since it uses as much as digits as its factorization.

872187352680649 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1950842880, while the sum is 76.

The spelling of 872187352680649 in words is "eight hundred seventy-two trillion, one hundred eighty-seven billion, three hundred fifty-two million, six hundred eighty thousand, six hundred forty-nine".