19724043410977 has 2 divisors, whose sum is σ = 19724043410978. Its totient is φ = 19724043410976.

The previous prime is 19724043410941. The next prime is 19724043411091. The reversal of 19724043410977 is 77901434042791.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13411884626176 + 6312158784801 = 3662224^2 + 2512401^2 .

It is an emirp because it is prime and its reverse (77901434042791) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 19724043410977 - 2³⁵ = 19689683672609 is a prime.

It is not a weakly prime, because it can be changed into another prime (19724043470977) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9862021705488 + 9862021705489.

It is an arithmetic number, because the mean of its divisors is an integer number (9862021705489).

Almost surely, 2^{19724043410977} is an apocalyptic number.

It is an amenable number.

19724043410977 is a deficient number, since it is larger than the sum of its proper divisors (1).

19724043410977 is an equidigital number, since it uses as much as digits as its factorization.

19724043410977 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10668672, while the sum is 58.

The spelling of 19724043410977 in words is "nineteen trillion, seven hundred twenty-four billion, forty-three million, four hundred ten thousand, nine hundred seventy-seven".