247442144557 has 8 divisors (see below), whose sum is σ = 248480922816. Its totient is φ = 246403955712.

The previous prime is 247442144533. The next prime is 247442144563. The reversal of 247442144557 is 755441244742.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-247442144557 is a prime.

It is a super-2 number, since 2×247442144557² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 247442144557.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (247442145557) 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 7 ways as a sum of consecutive naturals, for example, 704328 + ... + 995470.

It is an arithmetic number, because the mean of its divisors is an integer number (31060115352).

Almost surely, 2^247442144557 is an apocalyptic number.

It is an amenable number.

247442144557 is a deficient number, since it is larger than the sum of its proper divisors (1038778259).

247442144557 is a wasteful number, since it uses less digits than its factorization.

247442144557 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 294707.

The product of its digits is 5017600, while the sum is 49.

The spelling of 247442144557 in words is "two hundred forty-seven billion, four hundred forty-two million, one hundred forty-four thousand, five hundred fifty-seven".