781493714889 has 16 divisors (see below), whose sum is σ = 1051488648000. Its totient is φ = 516263988416.

The previous prime is 781493714867. The next prime is 781493714917. The reversal of 781493714889 is 988417394187.

It is a cyclic number.

It is not a de Polignac number, because 781493714889 - 2²⁰ = 781492666313 is a prime.

It is a super-2 number, since 2×781493714889² (a number of 25 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (781493714819) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1898994 + ... + 2273579.

It is an arithmetic number, because the mean of its divisors is an integer number (65718040500).

Almost surely, 2^781493714889 is an apocalyptic number.

It is an amenable number.

781493714889 is a deficient number, since it is larger than the sum of its proper divisors (269994933111).

781493714889 is a wasteful number, since it uses less digits than its factorization.

781493714889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4173144.

The product of its digits is 97542144, while the sum is 69.

The spelling of 781493714889 in words is "seven hundred eighty-one billion, four hundred ninety-three million, seven hundred fourteen thousand, eight hundred eighty-nine".