778893037493 has 4 divisors (see below), whose sum is σ = 779166240288. Its totient is φ = 778619834700.

The previous prime is 778893037469. The next prime is 778893037537. The reversal of 778893037493 is 394730398877.

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 778893037493 - 2²² = 778888843189 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (778893037453) 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, 136597121 + ... + 136602822.

It is an arithmetic number, because the mean of its divisors is an integer number (194791560072).

Almost surely, 2^778893037493 is an apocalyptic number.

It is an amenable number.

778893037493 is a deficient number, since it is larger than the sum of its proper divisors (273202795).

778893037493 is a wasteful number, since it uses less digits than its factorization.

778893037493 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 273202794.

The product of its (nonzero) digits is 192036096, while the sum is 68.

The spelling of 778893037493 in words is "seven hundred seventy-eight billion, eight hundred ninety-three million, thirty-seven thousand, four hundred ninety-three".