5645901961 has 12 divisors (see below), whose sum is σ = 6571622340. Its totient is φ = 4836441120.

The previous prime is 5645901949. The next prime is 5645901991. The reversal of 5645901961 is 1691095465.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 2188461961 + 3457440000 = 46781^2 + 58800^2 .

It is not a de Polignac number, because 5645901961 - 2¹³ = 5645893769 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (5645901941) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 50031 + ... + 117451.

It is an arithmetic number, because the mean of its divisors is an integer number (547635195).

Almost surely, 2^5645901961 is an apocalyptic number.

It is an amenable number.

5645901961 is a deficient number, since it is larger than the sum of its proper divisors (925720379).

5645901961 is a wasteful number, since it uses less digits than its factorization.

5645901961 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69144 (or 69137 counting only the distinct ones).

The product of its (nonzero) digits is 291600, while the sum is 46.

The square root of 5645901961 is about 75139.2171971468. The cubic root of 5645901961 is about 1780.6467751242.

The spelling of 5645901961 in words is "five billion, six hundred forty-five million, nine hundred one thousand, nine hundred sixty-one".