2501226705561 has 16 divisors (see below), whose sum is σ = 3549937377600. Its totient is φ = 1561972439808.

The previous prime is 2501226705557. The next prime is 2501226705647. The reversal of 2501226705561 is 1655076221052.

2501226705561 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 2501226705561 - 2² = 2501226705557 is a prime.

It is a super-2 number, since 2×2501226705561² (a number of 26 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (2501226705511) 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, 246518356 + ... + 246528501.

It is an arithmetic number, because the mean of its divisors is an integer number (221871086100).

Almost surely, 2^{2501226705561} is an apocalyptic number.

It is an amenable number.

2501226705561 is a deficient number, since it is larger than the sum of its proper divisors (1048710672039).

2501226705561 is a wasteful number, since it uses less digits than its factorization.

2501226705561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 493046968.

The product of its (nonzero) digits is 252000, while the sum is 42.

The spelling of 2501226705561 in words is "two trillion, five hundred one billion, two hundred twenty-six million, seven hundred five thousand, five hundred sixty-one".