15750047981 has 4 divisors (see below), whose sum is σ = 15985123392. Its totient is φ = 15514972572.

The previous prime is 15750047933. The next prime is 15750048011. The reversal of 15750047981 is 18974005751.

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 a de Polignac number, because none of the positive numbers 2^k-15750047981 is a prime.

It is a super-2 number, since 2×15750047981² (a number of 21 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 (15750047921) 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, 117537605 + ... + 117537738.

It is an arithmetic number, because the mean of its divisors is an integer number (3996280848).

Almost surely, 2^15750047981 is an apocalyptic number.

It is an amenable number.

15750047981 is a deficient number, since it is larger than the sum of its proper divisors (235075411).

15750047981 is an equidigital number, since it uses as much as digits as its factorization.

15750047981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 235075410.

The product of its (nonzero) digits is 352800, while the sum is 47.

The spelling of 15750047981 in words is "fifteen billion, seven hundred fifty million, forty-seven thousand, nine hundred eighty-one".