53531057778 has 16 divisors (see below), whose sum is σ = 116795035296. Its totient is φ = 16221532640.

The previous prime is 53531057683. The next prime is 53531057779. The reversal of 53531057778 is 87775013535.

It is a self number, because there is not a number n which added to its sum of digits gives 53531057778.

It is not an unprimeable number, because it can be changed into a prime (53531057779) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 405538251 + ... + 405538382.

It is an arithmetic number, because the mean of its divisors is an integer number (7299689706).

Almost surely, 2^53531057778 is an apocalyptic number.

53531057778 is an abundant number, since it is smaller than the sum of its proper divisors (63263977518).

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

53531057778 is a wasteful number, since it uses less digits than its factorization.

53531057778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 811076649.

The product of its (nonzero) digits is 3087000, while the sum is 51.

The spelling of 53531057778 in words is "fifty-three billion, five hundred thirty-one million, fifty-seven thousand, seven hundred seventy-eight".