53991888669 has 48 divisors (see below), whose sum is σ = 83557439680. Its totient is φ = 33493409280.

The previous prime is 53991888661. The next prime is 53991888733. The reversal of 53991888669 is 96688819935.

53991888669 is a `hidden beast` number, since 539 + 9 + 1 + 8 + 8 + 86 + 6 + 9 = 666.

53991888669 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 53991888669 - 2³ = 53991888661 is a prime.

It is a super-2 number, since 2×53991888669² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 53991888597 and 53991888606.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (53991888661) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 8205909 + ... + 8212485.

Almost surely, 2^53991888669 is an apocalyptic number.

It is an amenable number.

53991888669 is a deficient number, since it is larger than the sum of its proper divisors (29565551011).

53991888669 is a wasteful number, since it uses less digits than its factorization.

53991888669 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7450 (or 7447 counting only the distinct ones).

The product of its digits is 201553920, while the sum is 72.

The spelling of 53991888669 in words is "fifty-three billion, nine hundred ninety-one million, eight hundred eighty-eight thousand, six hundred sixty-nine".