997743851539 has 8 divisors (see below), whose sum is σ = 999059138640. Its totient is φ = 996429430656.

The previous prime is 997743851519. The next prime is 997743851579. The reversal of 997743851539 is 935158347799.

It is a happy number.

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-997743851539 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (997743851519) 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 7 ways as a sum of consecutive naturals, for example, 2104999 + ... + 2535055.

It is an arithmetic number, because the mean of its divisors is an integer number (124882392330).

Almost surely, 2^997743851539 is an apocalyptic number.

997743851539 is a deficient number, since it is larger than the sum of its proper divisors (1315287101).

997743851539 is a wasteful number, since it uses less digits than its factorization.

997743851539 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 433109.

The product of its digits is 257191200, while the sum is 70.

The spelling of 997743851539 in words is "nine hundred ninety-seven billion, seven hundred forty-three million, eight hundred fifty-one thousand, five hundred thirty-nine".