19877088197951 has 2 divisors, whose sum is σ = 19877088197952. Its totient is φ = 19877088197950.

The previous prime is 19877088197947. The next prime is 19877088197963. The reversal of 19877088197951 is 15979188077891.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 19877088197951 - 2² = 19877088197947 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19877088197051) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9938544098975 + 9938544098976.

It is an arithmetic number, because the mean of its divisors is an integer number (9938544098976).

Almost surely, 2^{19877088197951} is an apocalyptic number.

19877088197951 is a deficient number, since it is larger than the sum of its proper divisors (1).

19877088197951 is an equidigital number, since it uses as much as digits as its factorization.

19877088197951 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 640120320, while the sum is 80.

The spelling of 19877088197951 in words is "nineteen trillion, eight hundred seventy-seven billion, eighty-eight million, one hundred ninety-seven thousand, nine hundred fifty-one".