50515561501 has 2 divisors, whose sum is σ = 50515561502. Its totient is φ = 50515561500.

The previous prime is 50515561493. The next prime is 50515561511. The reversal of 50515561501 is 10516551505.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 47214944100 + 3300617401 = 217290^2 + 57451^2 .

It is a cyclic number.

It is not a de Polignac number, because 50515561501 - 2³ = 50515561493 is a prime.

It is a super-2 number, since 2×50515561501² (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 (50515561511) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25257780750 + 25257780751.

It is an arithmetic number, because the mean of its divisors is an integer number (25257780751).

Almost surely, 2^50515561501 is an apocalyptic number.

It is an amenable number.

50515561501 is a deficient number, since it is larger than the sum of its proper divisors (1).

50515561501 is an equidigital number, since it uses as much as digits as its factorization.

50515561501 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 18750, while the sum is 34.

The spelling of 50515561501 in words is "fifty billion, five hundred fifteen million, five hundred sixty-one thousand, five hundred one".