1572116352581 has 4 divisors (see below), whose sum is σ = 1572298593312. Its totient is φ = 1571934111852.

The previous prime is 1572116352563. The next prime is 1572116352601. The reversal of 1572116352581 is 1852536112751.

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 1572116352581 - 2¹⁰ = 1572116351557 is a prime.

It is a super-2 number, since 2×1572116352581² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1572116352281) 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, 91107425 + ... + 91124678.

It is an arithmetic number, because the mean of its divisors is an integer number (393074648328).

Almost surely, 2^{1572116352581} is an apocalyptic number.

It is an amenable number.

1572116352581 is a deficient number, since it is larger than the sum of its proper divisors (182240731).

1572116352581 is an equidigital number, since it uses as much as digits as its factorization.

1572116352581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 182240730.

The product of its digits is 504000, while the sum is 47.

The spelling of 1572116352581 in words is "one trillion, five hundred seventy-two billion, one hundred sixteen million, three hundred fifty-two thousand, five hundred eighty-one".