526257390097 has 4 divisors (see below), whose sum is σ = 527039348260. Its totient is φ = 525475431936.

The previous prime is 526257390083. The next prime is 526257390101. The reversal of 526257390097 is 790093752625.

It is a Cunningham number, because it is equal to 725436²+1.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 172221680016 + 354035710081 = 414996^2 + 595009^2 .

It is a cyclic number.

It is not a de Polignac number, because 526257390097 - 2¹¹ = 526257388049 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (526257390017) 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, 390978072 + ... + 390979417.

It is an arithmetic number, because the mean of its divisors is an integer number (131759837065).

Almost surely, 2^526257390097 is an apocalyptic number.

It is an amenable number.

526257390097 is a deficient number, since it is larger than the sum of its proper divisors (781958163).

526257390097 is an equidigital number, since it uses as much as digits as its factorization.

526257390097 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 781958162.

The product of its (nonzero) digits is 7144200, while the sum is 55.

The spelling of 526257390097 in words is "five hundred twenty-six billion, two hundred fifty-seven million, three hundred ninety thousand, ninety-seven".