2651021013645 has 48 divisors (see below), whose sum is σ = 4736839713840. Its totient is φ = 1370550730752.

The previous prime is 2651021013631. The next prime is 2651021013647. The reversal of 2651021013645 is 5463101201562.

2651021013645 is a `hidden beast` number, since 2 + 6 + 5 + 1 + 0 + 2 + 1 + 0 + 1 + 3 + 645 = 666.

2651021013645 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 8 ways, for example, as 158266321929 + 2492754691716 = 397827^2 + 1578846^2 .

It is not a de Polignac number, because 2651021013645 - 2²¹ = 2651018916493 is a prime.

It is a super-3 number, since 3×2651021013645³ (a number of 38 digits) contains 333 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2651021013647) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 2511604 + ... + 3407373.

It is an arithmetic number, because the mean of its divisors is an integer number (98684160705).

Almost surely, 2^{2651021013645} is an apocalyptic number.

It is an amenable number.

2651021013645 is a deficient number, since it is larger than the sum of its proper divisors (2085818700195).

2651021013645 is a wasteful number, since it uses less digits than its factorization.

2651021013645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5919294 (or 5919291 counting only the distinct ones).

The product of its (nonzero) digits is 43200, while the sum is 36.

The spelling of 2651021013645 in words is "two trillion, six hundred fifty-one billion, twenty-one million, thirteen thousand, six hundred forty-five".