2641557521 has 4 divisors (see below), whose sum is σ = 2756407872. Its totient is φ = 2526707172.

The previous prime is 2641557493. The next prime is 2641557533. The reversal of 2641557521 is 1257551462.

2641557521 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2641557521 - 2¹⁰ = 2641556497 is a prime.

It is a super-2 number, since 2×2641557521² = 13955652273503330882, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (2641557221) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 57425141 + ... + 57425186.

It is an arithmetic number, because the mean of its divisors is an integer number (689101968).

Almost surely, 2^2641557521 is an apocalyptic number.

It is an amenable number.

2641557521 is a deficient number, since it is larger than the sum of its proper divisors (114850351).

2641557521 is a wasteful number, since it uses less digits than its factorization.

2641557521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 114850350.

The product of its digits is 84000, while the sum is 38.

The square root of 2641557521 is about 51396.0846855089. The cubic root of 2641557521 is about 1382.3563887636.

The spelling of 2641557521 in words is "two billion, six hundred forty-one million, five hundred fifty-seven thousand, five hundred twenty-one".