2649378551 has 8 divisors (see below), whose sum is σ = 2655763200. Its totient is φ = 2643003000.

The previous prime is 2649378547. The next prime is 2649378559. The reversal of 2649378551 is 1558739462.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 2649378551 - 2² = 2649378547 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2649378551.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2649378559) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1214780 + ... + 1216958.

It is an arithmetic number, because the mean of its divisors is an integer number (331970400).

Almost surely, 2^2649378551 is an apocalyptic number.

2649378551 is a deficient number, since it is larger than the sum of its proper divisors (6384649).

2649378551 is a wasteful number, since it uses less digits than its factorization.

2649378551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4549.

The product of its digits is 1814400, while the sum is 50.

The square root of 2649378551 is about 51472.1143047379. The cubic root of 2649378551 is about 1383.7193218267.

The spelling of 2649378551 in words is "two billion, six hundred forty-nine million, three hundred seventy-eight thousand, five hundred fifty-one".