195580002581 has 2 divisors, whose sum is σ = 195580002582. Its totient is φ = 195580002580.

The previous prime is 195580002547. The next prime is 195580002587. The reversal of 195580002581 is 185200085591.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 194974350481 + 605652100 = 441559^2 + 24610^2 .

It is a cyclic number.

It is not a de Polignac number, because 195580002581 - 2²² = 195575808277 is a prime.

It is a super-2 number, since 2×195580002581² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (195580002587) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 97790001290 + 97790001291.

It is an arithmetic number, because the mean of its divisors is an integer number (97790001291).

Almost surely, 2^195580002581 is an apocalyptic number.

It is an amenable number.

195580002581 is a deficient number, since it is larger than the sum of its proper divisors (1).

195580002581 is an equidigital number, since it uses as much as digits as its factorization.

195580002581 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 144000, while the sum is 44.

The spelling of 195580002581 in words is "one hundred ninety-five billion, five hundred eighty million, two thousand, five hundred eighty-one".