15751488821 has 2 divisors, whose sum is σ = 15751488822. Its totient is φ = 15751488820.

The previous prime is 15751488791. The next prime is 15751488853. The reversal of 15751488821 is 12888415751.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11483479921 + 4268008900 = 107161^2 + 65330^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-15751488821 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 15751488821.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (15751488421) 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 as a sum of consecutive naturals, namely, 7875744410 + 7875744411.

It is an arithmetic number, because the mean of its divisors is an integer number (7875744411).

Almost surely, 2^15751488821 is an apocalyptic number.

It is an amenable number.

15751488821 is a deficient number, since it is larger than the sum of its proper divisors (1).

15751488821 is an equidigital number, since it uses as much as digits as its factorization.

15751488821 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 716800, while the sum is 50.

The spelling of 15751488821 in words is "fifteen billion, seven hundred fifty-one million, four hundred eighty-eight thousand, eight hundred twenty-one".