782640601409 has 2 divisors, whose sum is σ = 782640601410. Its totient is φ = 782640601408.

The previous prime is 782640601397. The next prime is 782640601439. The reversal of 782640601409 is 904106046287.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 492098041009 + 290542560400 = 701497^2 + 539020^2 .

It is a cyclic number.

It is not a de Polignac number, because 782640601409 - 2¹² = 782640597313 is a prime.

It is a super-2 number, since 2×782640601409² (a number of 25 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (782640601439) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 391320300704 + 391320300705.

It is an arithmetic number, because the mean of its divisors is an integer number (391320300705).

Almost surely, 2^782640601409 is an apocalyptic number.

It is an amenable number.

782640601409 is a deficient number, since it is larger than the sum of its proper divisors (1).

782640601409 is an equidigital number, since it uses as much as digits as its factorization.

782640601409 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 580608, while the sum is 47.

The spelling of 782640601409 in words is "seven hundred eighty-two billion, six hundred forty million, six hundred one thousand, four hundred nine".