16228538661961 has 2 divisors, whose sum is σ = 16228538661962. Its totient is φ = 16228538661960.

The previous prime is 16228538661941. The next prime is 16228538661983. The reversal of 16228538661961 is 16916683582261.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14345004750400 + 1883533911561 = 3787480^2 + 1372419^2 .

It is a cyclic number.

It is not a de Polignac number, because 16228538661961 - 2²³ = 16228530273353 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 16228538661893 and 16228538661902.

It is not a weakly prime, because it can be changed into another prime (16228538661941) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8114269330980 + 8114269330981.

It is an arithmetic number, because the mean of its divisors is an integer number (8114269330981).

Almost surely, 2^{16228538661961} is an apocalyptic number.

It is an amenable number.

16228538661961 is a deficient number, since it is larger than the sum of its proper divisors (1).

16228538661961 is an equidigital number, since it uses as much as digits as its factorization.

16228538661961 is an evil number, because the sum of its binary digits is even.

The product of its digits is 44789760, while the sum is 64.

The spelling of 16228538661961 in words is "sixteen trillion, two hundred twenty-eight billion, five hundred thirty-eight million, six hundred sixty-one thousand, nine hundred sixty-one".