3640522261 has 4 divisors (see below), whose sum is σ = 3656560032. Its totient is φ = 3624484492.

The previous prime is 3640522219. The next prime is 3640522297. The reversal of 3640522261 is 1622250463.

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 3640522261 - 2⁹ = 3640521749 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3640528261) 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, 8018545 + ... + 8018998.

It is an arithmetic number, because the mean of its divisors is an integer number (914140008).

Almost surely, 2^3640522261 is an apocalyptic number.

It is an amenable number.

3640522261 is a deficient number, since it is larger than the sum of its proper divisors (16037771).

3640522261 is a wasteful number, since it uses less digits than its factorization.

3640522261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16037770.

The product of its (nonzero) digits is 17280, while the sum is 31.

The square root of 3640522261 is about 60336.7405566459. The cubic root of 3640522261 is about 1538.3479023385.

The spelling of 3640522261 in words is "three billion, six hundred forty million, five hundred twenty-two thousand, two hundred sixty-one".