15996121951 has 2 divisors, whose sum is σ = 15996121952. Its totient is φ = 15996121950.

The previous prime is 15996121937. The next prime is 15996121979. The reversal of 15996121951 is 15912169951.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 15996121951 - 2¹¹ = 15996119903 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 15996121895 and 15996121904.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (15996121901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7998060975 + 7998060976.

It is an arithmetic number, because the mean of its divisors is an integer number (7998060976).

Almost surely, 2^15996121951 is an apocalyptic number.

15996121951 is a deficient number, since it is larger than the sum of its proper divisors (1).

15996121951 is an equidigital number, since it uses as much as digits as its factorization.

15996121951 is an evil number, because the sum of its binary digits is even.

The product of its digits is 218700, while the sum is 49.

The spelling of 15996121951 in words is "fifteen billion, nine hundred ninety-six million, one hundred twenty-one thousand, nine hundred fifty-one".