2643652433621 has 2 divisors, whose sum is σ = 2643652433622. Its totient is φ = 2643652433620.

The previous prime is 2643652433581. The next prime is 2643652433623. The reversal of 2643652433621 is 1263342563462.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2206083413521 + 437569020100 = 1485289^2 + 661490^2 .

It is a cyclic number.

It is not a de Polignac number, because 2643652433621 - 2¹⁸ = 2643652171477 is a prime.

It is a super-2 number, since 2×2643652433621² (a number of 26 digits) contains 22 as substring.

Together with 2643652433623, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2643652433623) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1321826216810 + 1321826216811.

It is an arithmetic number, because the mean of its divisors is an integer number (1321826216811).

Almost surely, 2^{2643652433621} is an apocalyptic number.

It is an amenable number.

2643652433621 is a deficient number, since it is larger than the sum of its proper divisors (1).

2643652433621 is an equidigital number, since it uses as much as digits as its factorization.

2643652433621 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3732480, while the sum is 47.

The spelling of 2643652433621 in words is "two trillion, six hundred forty-three billion, six hundred fifty-two million, four hundred thirty-three thousand, six hundred twenty-one".