4250020561661 has 16 divisors (see below), whose sum is σ = 5113046991360. Its totient is φ = 3450982313520.

The previous prime is 4250020561639. The next prime is 4250020561673. The reversal of 4250020561661 is 1661650200524.

It is a de Polignac number, because none of the positive numbers 2^k-4250020561661 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4250020561361) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2130926 + ... + 3611216.

It is an arithmetic number, because the mean of its divisors is an integer number (319565436960).

Almost surely, 2^{4250020561661} is an apocalyptic number.

It is an amenable number.

4250020561661 is a deficient number, since it is larger than the sum of its proper divisors (863026429699).

4250020561661 is a wasteful number, since it uses less digits than its factorization.

4250020561661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1501904.

The product of its (nonzero) digits is 86400, while the sum is 38.

The spelling of 4250020561661 in words is "four trillion, two hundred fifty billion, twenty million, five hundred sixty-one thousand, six hundred sixty-one".