2561525456213 has 4 divisors (see below), whose sum is σ = 2574936584448. Its totient is φ = 2548114327980.

The previous prime is 2561525456179. The next prime is 2561525456219. The reversal of 2561525456213 is 3126545251652.

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 2561525456213 - 2¹² = 2561525452117 is a prime.

It is a super-2 number, since 2×2561525456213² (a number of 26 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2561525456219) 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, 6705563831 + ... + 6705564212.

It is an arithmetic number, because the mean of its divisors is an integer number (643734146112).

Almost surely, 2^{2561525456213} is an apocalyptic number.

It is an amenable number.

2561525456213 is a deficient number, since it is larger than the sum of its proper divisors (13411128235).

2561525456213 is a wasteful number, since it uses less digits than its factorization.

2561525456213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13411128234.

The product of its digits is 2160000, while the sum is 47.

The spelling of 2561525456213 in words is "two trillion, five hundred sixty-one billion, five hundred twenty-five million, four hundred fifty-six thousand, two hundred thirteen".