1640558550461 has 2 divisors, whose sum is σ = 1640558550462. Its totient is φ = 1640558550460.

The previous prime is 1640558550457. The next prime is 1640558550479.

1640558550461 is nontrivially palindromic in base 10.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1603943727961 + 36614822500 = 1266469^2 + 191350^2 .

It is a palprime.

It is a cyclic number.

It is not a de Polignac number, because 1640558550461 - 2² = 1640558550457 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1640558553461) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 820279275230 + 820279275231.

It is an arithmetic number, because the mean of its divisors is an integer number (820279275231).

Almost surely, 2^{1640558550461} is an apocalyptic number.

It is an amenable number.

1640558550461 is a deficient number, since it is larger than the sum of its proper divisors (1).

1640558550461 is an equidigital number, since it uses as much as digits as its factorization.

1640558550461 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2880000, while the sum is 50.

The spelling of 1640558550461 in words is "one trillion, six hundred forty billion, five hundred fifty-eight million, five hundred fifty thousand, four hundred sixty-one".