2521542644 has 6 divisors (see below), whose sum is σ = 4412699634. Its totient is φ = 1260771320.

The previous prime is 2521542641. The next prime is 2521542659. The reversal of 2521542644 is 4462451252.

It can be written as a sum of positive squares in only one way, i.e., 1965148900 + 556393744 = 44330^2 + 23588^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2521542641) 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 as a sum of consecutive naturals, namely, 315192827 + ... + 315192834.

It is an arithmetic number, because the mean of its divisors is an integer number (735449939).

Almost surely, 2^2521542644 is an apocalyptic number.

It is an amenable number.

2521542644 is a deficient number, since it is larger than the sum of its proper divisors (1891156990).

2521542644 is a wasteful number, since it uses less digits than its factorization.

2521542644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 630385665 (or 630385663 counting only the distinct ones).

The product of its digits is 76800, while the sum is 35.

The square root of 2521542644 is about 50214.9643433110. The cubic root of 2521542644 is about 1361.0960462278.

Adding to 2521542644 its reverse (4462451252), we get a palindrome (6983993896).

The spelling of 2521542644 in words is "two billion, five hundred twenty-one million, five hundred forty-two thousand, six hundred forty-four".