785187128513 has 2 divisors, whose sum is σ = 785187128514. Its totient is φ = 785187128512.

The previous prime is 785187128503. The next prime is 785187128549. The reversal of 785187128513 is 315821781587.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 743920050064 + 41267078449 = 862508^2 + 203143^2 .

It is a cyclic number.

It is not a de Polignac number, because 785187128513 - 2⁶ = 785187128449 is a prime.

It is not a weakly prime, because it can be changed into another prime (785187128503) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 392593564256 + 392593564257.

It is an arithmetic number, because the mean of its divisors is an integer number (392593564257).

Almost surely, 2^785187128513 is an apocalyptic number.

It is an amenable number.

785187128513 is a deficient number, since it is larger than the sum of its proper divisors (1).

785187128513 is an equidigital number, since it uses as much as digits as its factorization.

785187128513 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3763200, while the sum is 56.

The spelling of 785187128513 in words is "seven hundred eighty-five billion, one hundred eighty-seven million, one hundred twenty-eight thousand, five hundred thirteen".