16557542641 has 2 divisors, whose sum is σ = 16557542642. Its totient is φ = 16557542640.

The previous prime is 16557542629. The next prime is 16557542671. The reversal of 16557542641 is 14624575561.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13970294416 + 2587248225 = 118196^2 + 50865^2 .

It is a cyclic number.

It is not a de Polignac number, because 16557542641 - 2⁹ = 16557542129 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 16557542591 and 16557542600.

It is not a weakly prime, because it can be changed into another prime (16557542671) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8278771320 + 8278771321.

It is an arithmetic number, because the mean of its divisors is an integer number (8278771321).

Almost surely, 2^16557542641 is an apocalyptic number.

It is an amenable number.

16557542641 is a deficient number, since it is larger than the sum of its proper divisors (1).

16557542641 is an equidigital number, since it uses as much as digits as its factorization.

16557542641 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1008000, while the sum is 46.

The spelling of 16557542641 in words is "sixteen billion, five hundred fifty-seven million, five hundred forty-two thousand, six hundred forty-one".