19776977123 has 2 divisors, whose sum is σ = 19776977124. Its totient is φ = 19776977122.

The previous prime is 19776977119. The next prime is 19776977137. The reversal of 19776977123 is 32177967791.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 19776977123 - 2² = 19776977119 is a prime.

It is a super-4 number, since 4×19776977123⁴ (a number of 42 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

It is not a weakly prime, because it can be changed into another prime (19776977173) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9888488561 + 9888488562.

It is an arithmetic number, because the mean of its divisors is an integer number (9888488562).

Almost surely, 2^19776977123 is an apocalyptic number.

19776977123 is a deficient number, since it is larger than the sum of its proper divisors (1).

19776977123 is an equidigital number, since it uses as much as digits as its factorization.

19776977123 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7001316, while the sum is 59.

The spelling of 19776977123 in words is "nineteen billion, seven hundred seventy-six million, nine hundred seventy-seven thousand, one hundred twenty-three".