5421432645 has 24 divisors (see below), whose sum is σ = 9551206392. Its totient is φ = 2844028800.

The previous prime is 5421432641. The next prime is 5421432661. The reversal of 5421432645 is 5462341245.

5421432645 is a `hidden beast` number, since 5 + 4 + 2 + 1 + 4 + 3 + 2 + 645 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 175907169 + 5245525476 = 13263^2 + 72426^2 .

It is not a de Polignac number, because 5421432645 - 2² = 5421432641 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5421432641) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 984766 + ... + 990255.

It is an arithmetic number, because the mean of its divisors is an integer number (397966933).

Almost surely, 2^5421432645 is an apocalyptic number.

It is an amenable number.

5421432645 is a deficient number, since it is larger than the sum of its proper divisors (4129773747).

5421432645 is a wasteful number, since it uses less digits than its factorization.

5421432645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1975093 (or 1975090 counting only the distinct ones).

The product of its digits is 115200, while the sum is 36.

The square root of 5421432645 is about 73630.3785471730. The cubic root of 5421432645 is about 1756.7286690262.

The spelling of 5421432645 in words is "five billion, four hundred twenty-one million, four hundred thirty-two thousand, six hundred forty-five".