53909771520 has 288 divisors, whose sum is σ = 189665409024. Its totient is φ = 12941107200.

The previous prime is 53909771471. The next prime is 53909771593. The reversal of 53909771520 is 2517790935.

It is a super-2 number, since 2×53909771520² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a self number, because there is not a number n which added to its sum of digits gives 53909771520.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4344525 + ... + 4356915.

It is an arithmetic number, because the mean of its divisors is an integer number (658560448).

Almost surely, 2^53909771520 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 53909771520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (94832704512).

53909771520 is an abundant number, since it is smaller than the sum of its proper divisors (135755637504).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

53909771520 is a wasteful number, since it uses less digits than its factorization.

53909771520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12529 (or 12515 counting only the distinct ones).

The product of its (nonzero) digits is 595350, while the sum is 48.

The spelling of 53909771520 in words is "fifty-three billion, nine hundred nine million, seven hundred seventy-one thousand, five hundred twenty".