85621805053 has 2 divisors, whose sum is σ = 85621805054. Its totient is φ = 85621805052.

The previous prime is 85621805033. The next prime is 85621805081. The reversal of 85621805053 is 35050812658.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 85569705529 + 52099524 = 292523^2 + 7218^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-85621805053 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (85621805033) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42810902526 + 42810902527.

It is an arithmetic number, because the mean of its divisors is an integer number (42810902527).

Almost surely, 2^85621805053 is an apocalyptic number.

It is an amenable number.

85621805053 is a deficient number, since it is larger than the sum of its proper divisors (1).

85621805053 is an equidigital number, since it uses as much as digits as its factorization.

85621805053 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 288000, while the sum is 43.

The spelling of 85621805053 in words is "eighty-five billion, six hundred twenty-one million, eight hundred five thousand, fifty-three".