1618584641 has 2 divisors, whose sum is σ = 1618584642. Its totient is φ = 1618584640.

The previous prime is 1618584619. The next prime is 1618584703. The reversal of 1618584641 is 1464858161.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1254576400 + 364008241 = 35420^2 + 19079^2 .

It is a cyclic number.

It is not a de Polignac number, because 1618584641 - 2³⁰ = 544842817 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1618584592 and 1618584601.

It is not a weakly prime, because it can be changed into another prime (1618584601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 809292320 + 809292321.

It is an arithmetic number, because the mean of its divisors is an integer number (809292321).

Almost surely, 2^1618584641 is an apocalyptic number.

It is an amenable number.

1618584641 is a deficient number, since it is larger than the sum of its proper divisors (1).

1618584641 is an equidigital number, since it uses as much as digits as its factorization.

1618584641 is an evil number, because the sum of its binary digits is even.

The product of its digits is 184320, while the sum is 44.

The square root of 1618584641 is about 40231.6373144320. The cubic root of 1618584641 is about 1174.1181591654.

The spelling of 1618584641 in words is "one billion, six hundred eighteen million, five hundred eighty-four thousand, six hundred forty-one".