19953883877 has 2 divisors, whose sum is σ = 19953883878. Its totient is φ = 19953883876.

The previous prime is 19953883867. The next prime is 19953883879. The reversal of 19953883877 is 77838835991.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11195544481 + 8758339396 = 105809^2 + 93586^2 .

It is a cyclic number.

It is not a de Polignac number, because 19953883877 - 2⁴ = 19953883861 is a prime.

It is a super-2 number, since 2×19953883877² (a number of 21 digits) contains 22 as substring.

Together with 19953883879, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19953883879) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9976941938 + 9976941939.

It is an arithmetic number, because the mean of its divisors is an integer number (9976941939).

Almost surely, 2^19953883877 is an apocalyptic number.

It is an amenable number.

19953883877 is a deficient number, since it is larger than the sum of its proper divisors (1).

19953883877 is an equidigital number, since it uses as much as digits as its factorization.

19953883877 is an evil number, because the sum of its binary digits is even.

The product of its digits is 91445760, while the sum is 68.

The spelling of 19953883877 in words is "nineteen billion, nine hundred fifty-three million, eight hundred eighty-three thousand, eight hundred seventy-seven".