2651265420261 has 16 divisors (see below), whose sum is σ = 3538019616384. Its totient is φ = 1766010968064.

The previous prime is 2651265420247. The next prime is 2651265420281. The reversal of 2651265420261 is 1620245621562.

It is a happy number.

It is not a de Polignac number, because 2651265420261 - 2⁶ = 2651265420197 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2651265420241) 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, 88766016 + ... + 88795878.

It is an arithmetic number, because the mean of its divisors is an integer number (221126226024).

Almost surely, 2^{2651265420261} is an apocalyptic number.

It is an amenable number.

2651265420261 is a deficient number, since it is larger than the sum of its proper divisors (886754196123).

2651265420261 is a wasteful number, since it uses less digits than its factorization.

2651265420261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53980.

The product of its (nonzero) digits is 345600, while the sum is 42.

The spelling of 2651265420261 in words is "two trillion, six hundred fifty-one billion, two hundred sixty-five million, four hundred twenty thousand, two hundred sixty-one".