3561657021772 has 6 divisors (see below), whose sum is σ = 6232899788108. Its totient is φ = 1780828510884.

The previous prime is 3561657021763. The next prime is 3561657021779. The reversal of 3561657021772 is 2771207561653.

3561657021772 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (3561657021779) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 445207127718 + ... + 445207127725.

Almost surely, 2^{3561657021772} is an apocalyptic number.

It is an amenable number.

3561657021772 is a deficient number, since it is larger than the sum of its proper divisors (2671242766336).

3561657021772 is a wasteful number, since it uses less digits than its factorization.

3561657021772 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 890414255447 (or 890414255445 counting only the distinct ones).

The product of its (nonzero) digits is 3704400, while the sum is 52.

The spelling of 3561657021772 in words is "three trillion, five hundred sixty-one billion, six hundred fifty-seven million, twenty-one thousand, seven hundred seventy-two".