53887387509 has 20 divisors (see below), whose sum is σ = 81862830720. Its totient is φ = 35316024840.

The previous prime is 53887387487. The next prime is 53887387511. The reversal of 53887387509 is 90578378835.

53887387509 is a `hidden beast` number, since 53 + 8 + 8 + 73 + 8 + 7 + 509 = 666.

It is a de Polignac number, because none of the positive numbers 2^k-53887387509 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (53887383509) 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 in 19 ways as a sum of consecutive naturals, for example, 5633157 + ... + 5642714.

It is an arithmetic number, because the mean of its divisors is an integer number (4093141536).

Almost surely, 2^53887387509 is an apocalyptic number.

53887387509 is a gapful number since it is divisible by the number (59) formed by its first and last digit.

It is an amenable number.

53887387509 is a deficient number, since it is larger than the sum of its proper divisors (27975443211).

53887387509 is a wasteful number, since it uses less digits than its factorization.

53887387509 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11275942 (or 11275933 counting only the distinct ones).

The product of its (nonzero) digits is 50803200, while the sum is 63.

The spelling of 53887387509 in words is "fifty-three billion, eight hundred eighty-seven million, three hundred eighty-seven thousand, five hundred nine".