261656225437453 has 16 divisors (see below), whose sum is σ = 326635260424704. Its totient is φ = 203628897981360.

The previous prime is 261656225437429. The next prime is 261656225437463. The reversal of 261656225437453 is 354734522656162.

It is a cyclic number.

It is not a de Polignac number, because 261656225437453 - 2⁹ = 261656225436941 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 261656225437391 and 261656225437400.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261656225437403) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2158854775 + ... + 2158975972.

It is an arithmetic number, because the mean of its divisors is an integer number (20414703776544).

Almost surely, 2^{261656225437453} is an apocalyptic number.

It is an amenable number.

261656225437453 is a deficient number, since it is larger than the sum of its proper divisors (64979034987251).

261656225437453 is a wasteful number, since it uses less digits than its factorization.

261656225437453 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4317831552.

The product of its digits is 217728000, while the sum is 61.

The spelling of 261656225437453 in words is "two hundred sixty-one trillion, six hundred fifty-six billion, two hundred twenty-five million, four hundred thirty-seven thousand, four hundred fifty-three".