2521061644 has 6 divisors (see below), whose sum is σ = 4411857884. Its totient is φ = 1260530820.

The previous prime is 2521061629. The next prime is 2521061657. The reversal of 2521061644 is 4461601252.

It is a happy number.

It is a super-3 number, since 3×2521061644³ (a number of 29 digits) contains 333 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 315132702 + ... + 315132709.

Almost surely, 2^2521061644 is an apocalyptic number.

It is an amenable number.

2521061644 is a deficient number, since it is larger than the sum of its proper divisors (1890796240).

2521061644 is a wasteful number, since it uses less digits than its factorization.

2521061644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 630265415 (or 630265413 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 31.

The square root of 2521061644 is about 50210.1747059299. The cubic root of 2521061644 is about 1361.0094948683.

Adding to 2521061644 its reverse (4461601252), we get a palindrome (6982662896).

The spelling of 2521061644 in words is "two billion, five hundred twenty-one million, sixty-one thousand, six hundred forty-four".