19957627951 has 4 divisors (see below), whose sum is σ = 19957986792. Its totient is φ = 19957269112.

The previous prime is 19957627867. The next prime is 19957627961. The reversal of 19957627951 is 15972675991.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 19957627951 - 2¹¹ = 19957625903 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 19957627951.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19957627961) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 76201 + ... + 213826.

It is an arithmetic number, because the mean of its divisors is an integer number (4989496698).

Almost surely, 2^19957627951 is an apocalyptic number.

19957627951 is a deficient number, since it is larger than the sum of its proper divisors (358841).

19957627951 is an equidigital number, since it uses as much as digits as its factorization.

19957627951 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 358840.

The product of its digits is 10716300, while the sum is 61.

The spelling of 19957627951 in words is "nineteen billion, nine hundred fifty-seven million, six hundred twenty-seven thousand, nine hundred fifty-one".