2105625661 has 8 divisors (see below), whose sum is σ = 2234944440. Its totient is φ = 1976913408.

The previous prime is 2105625659. The next prime is 2105625667. The reversal of 2105625661 is 1665265012.

It can be written as a sum of positive squares in 4 ways, for example, as 625300036 + 1480325625 = 25006^2 + 38475^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 2105625661 - 2¹ = 2105625659 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2105625667) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 144466 + ... + 158371.

It is an arithmetic number, because the mean of its divisors is an integer number (279368055).

Almost surely, 2^2105625661 is an apocalyptic number.

It is an amenable number.

2105625661 is a deficient number, since it is larger than the sum of its proper divisors (129318779).

2105625661 is a wasteful number, since it uses less digits than its factorization.

2105625661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 303263.

The product of its (nonzero) digits is 21600, while the sum is 34.

The square root of 2105625661 is about 45887.0968900845. The cubic root of 2105625661 is about 1281.7216540083.

The spelling of 2105625661 in words is "two billion, one hundred five million, six hundred twenty-five thousand, six hundred sixty-one".