20125461026261 has 4 divisors (see below), whose sum is σ = 20129271950124. Its totient is φ = 20121650102400.

The previous prime is 20125461026201. The next prime is 20125461026299. The reversal of 20125461026261 is 16262016452102.

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 11074352674225 + 9051108352036 = 3327815^2 + 3008506^2 .

It is a cyclic number.

It is not a de Polignac number, because 20125461026261 - 2²⁶ = 20125393917397 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20125461026201) 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, 1905454010 + ... + 1905464571.

It is an arithmetic number, because the mean of its divisors is an integer number (5032317987531).

Almost surely, 2^{20125461026261} is an apocalyptic number.

It is an amenable number.

20125461026261 is a deficient number, since it is larger than the sum of its proper divisors (3810923863).

20125461026261 is an equidigital number, since it uses as much as digits as its factorization.

20125461026261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3810923862.

The product of its (nonzero) digits is 69120, while the sum is 38.

Adding to 20125461026261 its reverse (16262016452102), we get a palindrome (36387477478363).

The spelling of 20125461026261 in words is "twenty trillion, one hundred twenty-five billion, four hundred sixty-one million, twenty-six thousand, two hundred sixty-one".