53511621587 has 4 divisors (see below), whose sum is σ = 53514797976. Its totient is φ = 53508445200.

The previous prime is 53511621563. The next prime is 53511621593. The reversal of 53511621587 is 78512611535.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 53511621587 - 2¹⁸ = 53511359443 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (53511621547) 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 3 ways as a sum of consecutive naturals, for example, 1562789 + ... + 1596662.

It is an arithmetic number, because the mean of its divisors is an integer number (13378699494).

Almost surely, 2^53511621587 is an apocalyptic number.

53511621587 is a deficient number, since it is larger than the sum of its proper divisors (3176389).

53511621587 is a wasteful number, since it uses less digits than its factorization.

53511621587 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3176388.

The product of its digits is 252000, while the sum is 44.

The spelling of 53511621587 in words is "fifty-three billion, five hundred eleven million, six hundred twenty-one thousand, five hundred eighty-seven".