2645861551 has 2 divisors, whose sum is σ = 2645861552. Its totient is φ = 2645861550.

The previous prime is 2645861539. The next prime is 2645861579. The reversal of 2645861551 is 1551685462.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2645861551 - 2¹³ = 2645853359 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2645861498 and 2645861507.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2645861591) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1322930775 + 1322930776.

It is an arithmetic number, because the mean of its divisors is an integer number (1322930776).

Almost surely, 2^2645861551 is an apocalyptic number.

2645861551 is a deficient number, since it is larger than the sum of its proper divisors (1).

2645861551 is an equidigital number, since it uses as much as digits as its factorization.

2645861551 is an evil number, because the sum of its binary digits is even.

The product of its digits is 288000, while the sum is 43.

The square root of 2645861551 is about 51437.9388292338. The cubic root of 2645861551 is about 1383.1067636029.

The spelling of 2645861551 in words is "two billion, six hundred forty-five million, eight hundred sixty-one thousand, five hundred fifty-one".