261535126603357 has 4 divisors (see below), whose sum is σ = 262360158548796. Its totient is φ = 260710094657920.

The previous prime is 261535126603279. The next prime is 261535126603459. The reversal of 261535126603357 is 753306621535162.

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 40287024006436 + 221248102596921 = 6347206^2 + 14874411^2 .

It is a cyclic number.

It is not a de Polignac number, because 261535126603357 - 2⁴⁷ = 120797638248029 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 261535126603298 and 261535126603307.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261535126303357) 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, 412515972244 + ... + 412515972877.

It is an arithmetic number, because the mean of its divisors is an integer number (65590039637199).

Almost surely, 2^{261535126603357} is an apocalyptic number.

It is an amenable number.

261535126603357 is a deficient number, since it is larger than the sum of its proper divisors (825031945439).

261535126603357 is an equidigital number, since it uses as much as digits as its factorization.

261535126603357 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 825031945438.

The product of its (nonzero) digits is 20412000, while the sum is 55.

The spelling of 261535126603357 in words is "two hundred sixty-one trillion, five hundred thirty-five billion, one hundred twenty-six million, six hundred three thousand, three hundred fifty-seven".