781528640453 has 4 divisors (see below), whose sum is σ = 852576698688. Its totient is φ = 710480582220.

The previous prime is 781528640413. The next prime is 781528640491. The reversal of 781528640453 is 354046825187.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 781528640453 - 2¹⁶ = 781528574917 is a prime.

It is a super-2 number, since 2×781528640453² (a number of 25 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 781528640395 and 781528640404.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (781528640413) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 35524029101 + ... + 35524029122.

It is an arithmetic number, because the mean of its divisors is an integer number (213144174672).

Almost surely, 2^781528640453 is an apocalyptic number.

It is an amenable number.

781528640453 is a deficient number, since it is larger than the sum of its proper divisors (71048058235).

781528640453 is a wasteful number, since it uses less digits than its factorization.

781528640453 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71048058234.

The product of its (nonzero) digits is 6451200, while the sum is 53.

The spelling of 781528640453 in words is "seven hundred eighty-one billion, five hundred twenty-eight million, six hundred forty thousand, four hundred fifty-three".