3645374561 has 4 divisors (see below), whose sum is σ = 3837236400. Its totient is φ = 3453512724.

The previous prime is 3645374479. The next prime is 3645374573. The reversal of 3645374561 is 1654735463.

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, and also an emirpimes, since its reverse is a distinct semiprime: 1654735463 = 151 ⋅10958513.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3645374561 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3645374591) 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, 95930891 + ... + 95930928.

It is an arithmetic number, because the mean of its divisors is an integer number (959309100).

Almost surely, 2^3645374561 is an apocalyptic number.

It is an amenable number.

3645374561 is a deficient number, since it is larger than the sum of its proper divisors (191861839).

3645374561 is a wasteful number, since it uses less digits than its factorization.

3645374561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 191861838.

The product of its digits is 907200, while the sum is 44.

The square root of 3645374561 is about 60376.9373270954. The cubic root of 3645374561 is about 1539.0310654545.

The spelling of 3645374561 in words is "three billion, six hundred forty-five million, three hundred seventy-four thousand, five hundred sixty-one".