16778428253 has 2 divisors, whose sum is σ = 16778428254. Its totient is φ = 16778428252.

The previous prime is 16778428243. The next prime is 16778428279. The reversal of 16778428253 is 35282487761.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 9331946404 + 7446481849 = 96602^2 + 86293^2 .

It is a cyclic number.

It is not a de Polignac number, because 16778428253 - 2⁸ = 16778427997 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 16778428195 and 16778428204.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16778428243) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8389214126 + 8389214127.

It is an arithmetic number, because the mean of its divisors is an integer number (8389214127).

Almost surely, 2^16778428253 is an apocalyptic number.

It is an amenable number.

16778428253 is a deficient number, since it is larger than the sum of its proper divisors (1).

16778428253 is an equidigital number, since it uses as much as digits as its factorization.

16778428253 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4515840, while the sum is 53.

The spelling of 16778428253 in words is "sixteen billion, seven hundred seventy-eight million, four hundred twenty-eight thousand, two hundred fifty-three".