84902887661 has 2 divisors, whose sum is σ = 84902887662. Its totient is φ = 84902887660.

The previous prime is 84902887633. The next prime is 84902887673. The reversal of 84902887661 is 16678820948.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 47877816100 + 37025071561 = 218810^2 + 192419^2 .

It is a cyclic number.

It is not a de Polignac number, because 84902887661 - 2¹⁰ = 84902886637 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 84902887661.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (84902887691) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42451443830 + 42451443831.

It is an arithmetic number, because the mean of its divisors is an integer number (42451443831).

Almost surely, 2^84902887661 is an apocalyptic number.

It is an amenable number.

84902887661 is a deficient number, since it is larger than the sum of its proper divisors (1).

84902887661 is an equidigital number, since it uses as much as digits as its factorization.

84902887661 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9289728, while the sum is 59.

The spelling of 84902887661 in words is "eighty-four billion, nine hundred two million, eight hundred eighty-seven thousand, six hundred sixty-one".