1542578147557 has 4 divisors (see below), whose sum is σ = 1542949588780. Its totient is φ = 1542206706336.

The previous prime is 1542578147479. The next prime is 1542578147563. The reversal of 1542578147557 is 7557418752451.

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 696755808961 + 845822338596 = 834719^2 + 919686^2 .

It is a cyclic number.

It is not a de Polignac number, because 1542578147557 - 2¹⁹ = 1542577623269 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1542578147495 and 1542578147504.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1542578147567) 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, 185714382 + ... + 185722687.

It is an arithmetic number, because the mean of its divisors is an integer number (385737397195).

Almost surely, 2^{1542578147557} is an apocalyptic number.

It is an amenable number.

1542578147557 is a deficient number, since it is larger than the sum of its proper divisors (371441223).

1542578147557 is an equidigital number, since it uses as much as digits as its factorization.

1542578147557 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 371441222.

The product of its digits is 54880000, while the sum is 61.

The spelling of 1542578147557 in words is "one trillion, five hundred forty-two billion, five hundred seventy-eight million, one hundred forty-seven thousand, five hundred fifty-seven".