781452513122 has 54 divisors (see below), whose sum is σ = 1250921373057. Its totient is φ = 366077437488.

The previous prime is 781452513119. The next prime is 781452513133. The reversal of 781452513122 is 221315254187.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 500668041241 + 280784471881 = 707579^2 + 529891^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=625081.

It is a super-2 number, since 2×781452513122² (a number of 25 digits) contains 22 as substring.

Its product of digits (134400) is a multiple of the sum of its prime factors (768).

It is a self number, because there is not a number n which added to its sum of digits gives 781452513122.

It is an unprimeable number.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 3966763928 + ... + 3966764124.

Almost surely, 2^781452513122 is an apocalyptic number.

781452513122 is a deficient number, since it is larger than the sum of its proper divisors (469468859935).

781452513122 is an equidigital number, since it uses as much as digits as its factorization.

781452513122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 768 (or 385 counting only the distinct ones).

The product of its digits is 134400, while the sum is 41.

The spelling of 781452513122 in words is "seven hundred eighty-one billion, four hundred fifty-two million, five hundred thirteen thousand, one hundred twenty-two".