48778667521 has 4 divisors (see below), whose sum is σ = 48852463444. Its totient is φ = 48704871600.

The previous prime is 48778667459. The next prime is 48778667533. The reversal of 48778667521 is 12576687784.

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

It can be written as a sum of positive squares in 2 ways, for example, as 22360716225 + 26417951296 = 149535^2 + 162536^2 .

It is a cyclic number.

It is not a de Polignac number, because 48778667521 - 2²⁷ = 48644449793 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 48778667521.

It is not an unprimeable number, because it can be changed into a prime (48778667221) 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, 36896970 + ... + 36898291.

It is an arithmetic number, because the mean of its divisors is an integer number (12213115861).

Almost surely, 2^48778667521 is an apocalyptic number.

It is an amenable number.

48778667521 is a deficient number, since it is larger than the sum of its proper divisors (73795923).

48778667521 is an equidigital number, since it uses as much as digits as its factorization.

48778667521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 73795922.

The product of its digits is 31610880, while the sum is 61.

The spelling of 48778667521 in words is "forty-eight billion, seven hundred seventy-eight million, six hundred sixty-seven thousand, five hundred twenty-one".