25561346155 has 4 divisors (see below), whose sum is σ = 30673615392. Its totient is φ = 20449076920.

The previous prime is 25561346137. The next prime is 25561346159. The reversal of 25561346155 is 55164316552.

It is a happy number.

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

It is a de Polignac number, because none of the positive numbers 2^k-25561346155 is a prime.

It is a super-3 number, since 3×25561346155³ (a number of 32 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25561346159) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2556134611 + ... + 2556134620.

It is an arithmetic number, because the mean of its divisors is an integer number (7668403848).

Almost surely, 2^25561346155 is an apocalyptic number.

25561346155 is a deficient number, since it is larger than the sum of its proper divisors (5112269237).

25561346155 is an equidigital number, since it uses as much as digits as its factorization.

25561346155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5112269236.

The product of its digits is 540000, while the sum is 43.

The spelling of 25561346155 in words is "twenty-five billion, five hundred sixty-one million, three hundred forty-six thousand, one hundred fifty-five".