726316978457 has 4 divisors (see below), whose sum is σ = 830076546816. Its totient is φ = 622557410100.

The previous prime is 726316978447. The next prime is 726316978463. The reversal of 726316978457 is 754879613627.

726316978457 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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, and also an emirpimes, since its reverse is a distinct semiprime: 754879613627 = 9311 ⋅81073957.

It is a cyclic number.

It is not a de Polignac number, because 726316978457 - 2¹⁶ = 726316912921 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 726316978393 and 726316978402.

It is not an unprimeable number, because it can be changed into a prime (726316978447) 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, 51879784169 + ... + 51879784182.

It is an arithmetic number, because the mean of its divisors is an integer number (207519136704).

Almost surely, 2^726316978457 is an apocalyptic number.

It is an amenable number.

726316978457 is a deficient number, since it is larger than the sum of its proper divisors (103759568359).

726316978457 is a wasteful number, since it uses less digits than its factorization.

726316978457 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 103759568358.

The product of its digits is 106686720, while the sum is 65.

The spelling of 726316978457 in words is "seven hundred twenty-six billion, three hundred sixteen million, nine hundred seventy-eight thousand, four hundred fifty-seven".