84990551641 has 2 divisors, whose sum is σ = 84990551642. Its totient is φ = 84990551640.

The previous prime is 84990551627. The next prime is 84990551677. The reversal of 84990551641 is 14615509948.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 50364785241 + 34625766400 = 224421^2 + 186080^2 .

It is a cyclic number.

It is not a de Polignac number, because 84990551641 - 2⁵ = 84990551609 is a prime.

It is not a weakly prime, because it can be changed into another prime (84990551141) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42495275820 + 42495275821.

It is an arithmetic number, because the mean of its divisors is an integer number (42495275821).

Almost surely, 2^84990551641 is an apocalyptic number.

It is an amenable number.

84990551641 is a deficient number, since it is larger than the sum of its proper divisors (1).

84990551641 is an equidigital number, since it uses as much as digits as its factorization.

84990551641 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1555200, while the sum is 52.

The spelling of 84990551641 in words is "eighty-four billion, nine hundred ninety million, five hundred fifty-one thousand, six hundred forty-one".