4005525451521 has 16 divisors (see below), whose sum is σ = 5913177331968. Its totient is φ = 2391358477200.

The previous prime is 4005525451517. The next prime is 4005525451567. The reversal of 4005525451521 is 1251545255004.

It is a happy number.

It is not a de Polignac number, because 4005525451521 - 2² = 4005525451517 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 4005525451521.

It is not an unprimeable number, because it can be changed into a prime (4005525451591) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 905815395 + ... + 905819816.

It is an arithmetic number, because the mean of its divisors is an integer number (369573583248).

Almost surely, 2^{4005525451521} is an apocalyptic number.

It is an amenable number.

4005525451521 is a deficient number, since it is larger than the sum of its proper divisors (1907651880447).

4005525451521 is a wasteful number, since it uses less digits than its factorization.

4005525451521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1811635292.

The product of its (nonzero) digits is 200000, while the sum is 39.

The spelling of 4005525451521 in words is "four trillion, five billion, five hundred twenty-five million, four hundred fifty-one thousand, five hundred twenty-one".