2641645544651 has 4 divisors (see below), whose sum is σ = 2691487913472. Its totient is φ = 2591803175832.

The previous prime is 2641645544609. The next prime is 2641645544689. The reversal of 2641645544651 is 1564455461462.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2641645544651 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (53), and also a Moran number because the ratio is a prime number: 49842368767 = 2641645544651 / (2 + 6 + 4 + 1 + 6 + 4 + 5 + 5 + 4 + 4 + 6 + 5 + 1).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2641645544593 and 2641645544602.

It is not an unprimeable number, because it can be changed into a prime (2641645144651) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 24921184331 + ... + 24921184436.

It is an arithmetic number, because the mean of its divisors is an integer number (672871978368).

Almost surely, 2^{2641645544651} is an apocalyptic number.

2641645544651 is a deficient number, since it is larger than the sum of its proper divisors (49842368821).

2641645544651 is an equidigital number, since it uses as much as digits as its factorization.

2641645544651 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49842368820.

The product of its digits is 13824000, while the sum is 53.

The spelling of 2641645544651 in words is "two trillion, six hundred forty-one billion, six hundred forty-five million, five hundred forty-four thousand, six hundred fifty-one".