1623728273261 has 2 divisors, whose sum is σ = 1623728273262. Its totient is φ = 1623728273260.

The previous prime is 1623728273221. The next prime is 1623728273309.

1623728273261 is nontrivially palindromic in base 10.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1193543140036 + 430185133225 = 1092494^2 + 655885^2 .

It is a palprime.

It is a cyclic number.

It is not a de Polignac number, because 1623728273261 - 2⁶ = 1623728273197 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1623728273221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 811864136630 + 811864136631.

It is an arithmetic number, because the mean of its divisors is an integer number (811864136631).

Almost surely, 2^{1623728273261} is an apocalyptic number.

It is an amenable number.

1623728273261 is a deficient number, since it is larger than the sum of its proper divisors (1).

1623728273261 is an equidigital number, since it uses as much as digits as its factorization.

1623728273261 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2032128, while the sum is 50.

The spelling of 1623728273261 in words is "one trillion, six hundred twenty-three billion, seven hundred twenty-eight million, two hundred seventy-three thousand, two hundred sixty-one".