50036601581 has 2 divisors, whose sum is σ = 50036601582. Its totient is φ = 50036601580.

The previous prime is 50036601569. The next prime is 50036601697. The reversal of 50036601581 is 18510663005.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 43528145956 + 6508455625 = 208634^2 + 80675^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-50036601581 is a prime.

It is a super-2 number, since 2×50036601581² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (50036601281) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25018300790 + 25018300791.

It is an arithmetic number, because the mean of its divisors is an integer number (25018300791).

Almost surely, 2^50036601581 is an apocalyptic number.

It is an amenable number.

50036601581 is a deficient number, since it is larger than the sum of its proper divisors (1).

50036601581 is an equidigital number, since it uses as much as digits as its factorization.

50036601581 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 21600, while the sum is 35.

The spelling of 50036601581 in words is "fifty billion, thirty-six million, six hundred one thousand, five hundred eighty-one".