4521981347557 has 4 divisors (see below), whose sum is σ = 4527102505120. Its totient is φ = 4516860189996.

The previous prime is 4521981347509. The next prime is 4521981347563. The reversal of 4521981347557 is 7557431891254.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 4521981347557 - 2¹⁵ = 4521981314789 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 4521981347495 and 4521981347504.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4521981348557) 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, 2560577457 + ... + 2560579222.

It is an arithmetic number, because the mean of its divisors is an integer number (1131775626280).

Almost surely, 2^{4521981347557} is an apocalyptic number.

It is an amenable number.

4521981347557 is a deficient number, since it is larger than the sum of its proper divisors (5121157563).

4521981347557 is an equidigital number, since it uses as much as digits as its factorization.

4521981347557 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5121157562.

The product of its digits is 42336000, while the sum is 61.

The spelling of 4521981347557 in words is "four trillion, five hundred twenty-one billion, nine hundred eighty-one million, three hundred forty-seven thousand, five hundred fifty-seven".