236738397772781 has 2 divisors, whose sum is σ = 236738397772782. Its totient is φ = 236738397772780.

The previous prime is 236738397772741. The next prime is 236738397772823. The reversal of 236738397772781 is 187277793837632.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 204676371445225 + 32062026327556 = 14306515^2 + 5662334^2 .

It is a cyclic number.

It is not a de Polignac number, because 236738397772781 - 2¹⁴ = 236738397756397 is a prime.

It is a super-2 number, since 2×236738397772781² (a number of 30 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 236738397772696 and 236738397772705.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (236738397772741) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 118369198886390 + 118369198886391.

It is an arithmetic number, because the mean of its divisors is an integer number (118369198886391).

Almost surely, 2^{236738397772781} is an apocalyptic number.

It is an amenable number.

236738397772781 is a deficient number, since it is larger than the sum of its proper divisors (1).

236738397772781 is an equidigital number, since it uses as much as digits as its factorization.

236738397772781 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6273179136, while the sum is 80.

The spelling of 236738397772781 in words is "two hundred thirty-six trillion, seven hundred thirty-eight billion, three hundred ninety-seven million, seven hundred seventy-two thousand, seven hundred eighty-one".