2445641661 has 16 divisors (see below), whose sum is σ = 3283238016. Its totient is φ = 1619257536.

The previous prime is 2445641621. The next prime is 2445641683. The reversal of 2445641661 is 1661465442.

It is not a de Polignac number, because 2445641661 - 2⁷ = 2445641533 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2445641621) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 632811 + ... + 636663.

It is an arithmetic number, because the mean of its divisors is an integer number (205202376).

Almost surely, 2^2445641661 is an apocalyptic number.

It is an amenable number.

2445641661 is a deficient number, since it is larger than the sum of its proper divisors (837596355).

2445641661 is a wasteful number, since it uses less digits than its factorization.

2445641661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5252.

The product of its digits is 138240, while the sum is 39.

The square root of 2445641661 is about 49453.4292137562. The cubic root of 2445641661 is about 1347.2998909557.

The spelling of 2445641661 in words is "two billion, four hundred forty-five million, six hundred forty-one thousand, six hundred sixty-one".