2649378999 has 16 divisors (see below), whose sum is σ = 3648475872. Its totient is φ = 1709180928.

The previous prime is 2649378973. The next prime is 2649379001. The reversal of 2649378999 is 9998739462.

It is not a de Polignac number, because 2649378999 - 2¹³ = 2649370807 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2649378499) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 102522 + ... + 125735.

It is an arithmetic number, because the mean of its divisors is an integer number (228029742).

Almost surely, 2^2649378999 is an apocalyptic number.

2649378999 is a deficient number, since it is larger than the sum of its proper divisors (999096873).

2649378999 is a wasteful number, since it uses less digits than its factorization.

2649378999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 228386.

The product of its digits is 52907904, while the sum is 66.

The square root of 2649378999 is about 51472.1186566086. The cubic root of 2649378999 is about 1383.7193998206.

The spelling of 2649378999 in words is "two billion, six hundred forty-nine million, three hundred seventy-eight thousand, nine hundred ninety-nine".