2645215551 has 12 divisors (see below), whose sum is σ = 4168218600. Its totient is φ = 1603160880.

The previous prime is 2645215501. The next prime is 2645215583. The reversal of 2645215551 is 1555125462.

2645215551 is a `hidden beast` number, since 2 + 6 + 452 + 155 + 51 = 666.

It is not a de Polignac number, because 2645215551 - 2⁹ = 2645215039 is a prime.

It is a super-2 number, since 2×2645215551² = 13994330622504467202, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2645215501) 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 11 ways as a sum of consecutive naturals, for example, 13359576 + ... + 13359773.

It is an arithmetic number, because the mean of its divisors is an integer number (347351550).

Almost surely, 2^2645215551 is an apocalyptic number.

2645215551 is a deficient number, since it is larger than the sum of its proper divisors (1523003049).

2645215551 is a wasteful number, since it uses less digits than its factorization.

2645215551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26719366 (or 26719363 counting only the distinct ones).

The product of its digits is 60000, while the sum is 36.

The square root of 2645215551 is about 51431.6590341008. The cubic root of 2645215551 is about 1382.9941903536.

It can be divided in two parts, 264521 and 5551, that added together give a palindrome (270072).

The spelling of 2645215551 in words is "two billion, six hundred forty-five million, two hundred fifteen thousand, five hundred fifty-one".