780513583121 has 16 divisors (see below), whose sum is σ = 833025145680. Its totient is φ = 728755107840.

The previous prime is 780513583097. The next prime is 780513583139. The reversal of 780513583121 is 121385315087.

It can be written as a sum of positive squares in 8 ways, for example, as 108382516225 + 672131066896 = 329215^2 + 819836^2 .

It is a de Polignac number, because none of the positive numbers 2^k-780513583121 is a prime.

It is a super-2 number, since 2×780513583121² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (780513583721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 948395 + ... + 1568591.

It is an arithmetic number, because the mean of its divisors is an integer number (52064071605).

Almost surely, 2^780513583121 is an apocalyptic number.

It is an amenable number.

780513583121 is a deficient number, since it is larger than the sum of its proper divisors (52511562559).

780513583121 is a wasteful number, since it uses less digits than its factorization.

780513583121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 620804.

The product of its (nonzero) digits is 201600, while the sum is 44.

The spelling of 780513583121 in words is "seven hundred eighty billion, five hundred thirteen million, five hundred eighty-three thousand, one hundred twenty-one".