781211862145 has 32 divisors (see below), whose sum is σ = 1101424351104. Its totient is φ = 524412057600.

The previous prime is 781211862127. The next prime is 781211862169. The reversal of 781211862145 is 541268112187.

It is not a de Polignac number, because 781211862145 - 2³¹ = 779064378497 is a prime.

It is a super-2 number, since 2×781211862145² (a number of 25 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 781211862095 and 781211862104.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 12784465 + ... + 12845425.

It is an arithmetic number, because the mean of its divisors is an integer number (34419510972).

Almost surely, 2^781211862145 is an apocalyptic number.

It is an amenable number.

781211862145 is a deficient number, since it is larger than the sum of its proper divisors (320212488959).

781211862145 is a wasteful number, since it uses less digits than its factorization.

781211862145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78913.

The product of its digits is 215040, while the sum is 46.

The spelling of 781211862145 in words is "seven hundred eighty-one billion, two hundred eleven million, eight hundred sixty-two thousand, one hundred forty-five".