726157423235657 has 4 divisors (see below), whose sum is σ = 829894197983616. Its totient is φ = 622420648487700.

The previous prime is 726157423235597. The next prime is 726157423235689. The reversal of 726157423235657 is 756532324751627.

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 726157423235657 - 2¹⁴ = 726157423219273 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 726157423235593 and 726157423235602.

It is not an unprimeable number, because it can be changed into a prime (726157423235557) 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, 51868387373969 + ... + 51868387373982.

It is an arithmetic number, because the mean of its divisors is an integer number (207473549495904).

Almost surely, 2^{726157423235657} is an apocalyptic number.

It is an amenable number.

726157423235657 is a deficient number, since it is larger than the sum of its proper divisors (103736774747959).

726157423235657 is a wasteful number, since it uses less digits than its factorization.

726157423235657 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 103736774747958.

The product of its digits is 444528000, while the sum is 65.

The spelling of 726157423235657 in words is "seven hundred twenty-six trillion, one hundred fifty-seven billion, four hundred twenty-three million, two hundred thirty-five thousand, six hundred fifty-seven".