40448847521 has 4 divisors (see below), whose sum is σ = 41111943444. Its totient is φ = 39785751600.

The previous prime is 40448847511. The next prime is 40448847577. The reversal of 40448847521 is 12574884404.

40448847521 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 22268100625 + 18180746896 = 149225^2 + 134836^2 .

It is a cyclic number.

It is not a de Polignac number, because 40448847521 - 2²² = 40444653217 is a prime.

It is a super-2 number, since 2×40448847521² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (40448847511) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 331547870 + ... + 331547991.

It is an arithmetic number, because the mean of its divisors is an integer number (10277985861).

Almost surely, 2^40448847521 is an apocalyptic number.

It is an amenable number.

40448847521 is a deficient number, since it is larger than the sum of its proper divisors (663095923).

40448847521 is an equidigital number, since it uses as much as digits as its factorization.

40448847521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 663095922.

The product of its (nonzero) digits is 1146880, while the sum is 47.

The spelling of 40448847521 in words is "forty billion, four hundred forty-eight million, eight hundred forty-seven thousand, five hundred twenty-one".