783117578491 has 4 divisors (see below), whose sum is σ = 790871217984. Its totient is φ = 775363939000.

The previous prime is 783117578459. The next prime is 783117578497. The reversal of 783117578491 is 194875711387.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 194875711387 = 7 ⋅27839387341.

It is a cyclic number.

It is not a de Polignac number, because 783117578491 - 2⁵ = 783117578459 is a prime.

It is a super-2 number, since 2×783117578491² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (783117578497) 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, 3876819595 + ... + 3876819796.

It is an arithmetic number, because the mean of its divisors is an integer number (197717804496).

Almost surely, 2^783117578491 is an apocalyptic number.

783117578491 is a deficient number, since it is larger than the sum of its proper divisors (7753639493).

783117578491 is a wasteful number, since it uses less digits than its factorization.

783117578491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7753639492.

The product of its digits is 11854080, while the sum is 61.

The spelling of 783117578491 in words is "seven hundred eighty-three billion, one hundred seventeen million, five hundred seventy-eight thousand, four hundred ninety-one".