16126731561 has 4 divisors (see below), whose sum is σ = 21502308752. Its totient is φ = 10751154372.

The previous prime is 16126731541. The next prime is 16126731571. The reversal of 16126731561 is 16513762161.

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 not a de Polignac number, because 16126731561 - 2¹¹ = 16126729513 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16126731541) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2687788591 + ... + 2687788596.

It is an arithmetic number, because the mean of its divisors is an integer number (5375577188).

Almost surely, 2^16126731561 is an apocalyptic number.

It is an amenable number.

16126731561 is a deficient number, since it is larger than the sum of its proper divisors (5375577191).

16126731561 is an equidigital number, since it uses as much as digits as its factorization.

16126731561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5375577190.

The product of its digits is 45360, while the sum is 39.

The spelling of 16126731561 in words is "sixteen billion, one hundred twenty-six million, seven hundred thirty-one thousand, five hundred sixty-one".