19777450799 has 2 divisors, whose sum is σ = 19777450800. Its totient is φ = 19777450798.

The previous prime is 19777450787. The next prime is 19777450807. The reversal of 19777450799 is 99705477791.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-19777450799 is a prime.

It is a super-2 number, since 2×19777450799² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19777450709) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9888725399 + 9888725400.

It is an arithmetic number, because the mean of its divisors is an integer number (9888725400).

Almost surely, 2^19777450799 is an apocalyptic number.

19777450799 is a deficient number, since it is larger than the sum of its proper divisors (1).

19777450799 is an equidigital number, since it uses as much as digits as its factorization.

19777450799 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 35006580, while the sum is 65.

The spelling of 19777450799 in words is "nineteen billion, seven hundred seventy-seven million, four hundred fifty thousand, seven hundred ninety-nine".