53399979648 has 160 divisors (see below), whose sum is σ = 162794806020. Its totient is φ = 17365708800.

The previous prime is 53399979629. The next prime is 53399979649. The reversal of 53399979648 is 84697999335.

It can be written as a sum of positive squares in 2 ways, for example, as 45696757824 + 7703221824 = 213768^2 + 87768^2 .

It is a Harshad number since it is a multiple of its sum of digits (72).

It is not an unprimeable number, because it can be changed into a prime (53399979649) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 362278 + ... + 487898.

Almost surely, 2^53399979648 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 53399979648, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (81397403010).

53399979648 is an abundant number, since it is smaller than the sum of its proper divisors (109394826372).

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

53399979648 is a wasteful number, since it uses less digits than its factorization.

53399979648 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 125688 (or 125667 counting only the distinct ones).

The product of its digits is 396809280, while the sum is 72.

The spelling of 53399979648 in words is "fifty-three billion, three hundred ninety-nine million, nine hundred seventy-nine thousand, six hundred forty-eight".