781225676545 has 4 divisors (see below), whose sum is σ = 937470811860. Its totient is φ = 624980541232.

The previous prime is 781225676533. The next prime is 781225676593. The reversal of 781225676545 is 545676522187.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 315998006769 + 465227669776 = 562137^2 + 682076^2 .

It is a cyclic number.

It is not a de Polignac number, because 781225676545 - 2⁷ = 781225676417 is a prime.

It is a super-2 number, since 2×781225676545² (a number of 25 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 781225676545.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 78122567650 + ... + 78122567659.

It is an arithmetic number, because the mean of its divisors is an integer number (234367702965).

Almost surely, 2^781225676545 is an apocalyptic number.

It is an amenable number.

781225676545 is a deficient number, since it is larger than the sum of its proper divisors (156245135315).

781225676545 is a wasteful number, since it uses less digits than its factorization.

781225676545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 156245135314.

The product of its digits is 28224000, while the sum is 58.

The spelling of 781225676545 in words is "seven hundred eighty-one billion, two hundred twenty-five million, six hundred seventy-six thousand, five hundred forty-five".