3249605661 has 4 divisors (see below), whose sum is σ = 4332807552. Its totient is φ = 2166403772.

The previous prime is 3249605657. The next prime is 3249605677. The reversal of 3249605661 is 1665069423.

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 3249605661 - 2² = 3249605657 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3249605861) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 541600941 + ... + 541600946.

It is an arithmetic number, because the mean of its divisors is an integer number (1083201888).

Almost surely, 2^3249605661 is an apocalyptic number.

It is an amenable number.

3249605661 is a deficient number, since it is larger than the sum of its proper divisors (1083201891).

3249605661 is a wasteful number, since it uses less digits than its factorization.

3249605661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1083201890.

The product of its (nonzero) digits is 233280, while the sum is 42.

The square root of 3249605661 is about 57005.3125682160. The cubic root of 3249605661 is about 1481.1881226658.

The spelling of 3249605661 in words is "three billion, two hundred forty-nine million, six hundred five thousand, six hundred sixty-one".