85552990421 has 2 divisors, whose sum is σ = 85552990422. Its totient is φ = 85552990420.

The previous prime is 85552990387. The next prime is 85552990427. The reversal of 85552990421 is 12409925558.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 49958508196 + 35594482225 = 223514^2 + 188665^2 .

It is a cyclic number.

It is not a de Polignac number, because 85552990421 - 2⁶ = 85552990357 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 85552990421.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (85552990427) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42776495210 + 42776495211.

It is an arithmetic number, because the mean of its divisors is an integer number (42776495211).

Almost surely, 2^85552990421 is an apocalyptic number.

It is an amenable number.

85552990421 is a deficient number, since it is larger than the sum of its proper divisors (1).

85552990421 is an equidigital number, since it uses as much as digits as its factorization.

85552990421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1296000, while the sum is 50.

The spelling of 85552990421 in words is "eighty-five billion, five hundred fifty-two million, nine hundred ninety thousand, four hundred twenty-one".