85550557 has 2 divisors, whose sum is σ = 85550558. Its totient is φ = 85550556.

The previous prime is 85550537. The next prime is 85550561. The reversal of 85550557 is 75505558.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 66243321 + 19307236 = 8139^2 + 4394^2 .

It is a cyclic number.

It is not a de Polignac number, because 85550557 - 2⁷ = 85550429 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (85550537) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42775278 + 42775279.

It is an arithmetic number, because the mean of its divisors is an integer number (42775279).

Almost surely, 2^85550557 is an apocalyptic number.

It is an amenable number.

85550557 is a deficient number, since it is larger than the sum of its proper divisors (1).

85550557 is an equidigital number, since it uses as much as digits as its factorization.

85550557 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 175000, while the sum is 40.

The square root of 85550557 is about 9249.3544099034. The cubic root of 85550557 is about 440.6302212013.

The spelling of 85550557 in words is "eighty-five million, five hundred fifty thousand, five hundred fifty-seven".