12442400077 has 2 divisors, whose sum is σ = 12442400078. Its totient is φ = 12442400076.

The previous prime is 12442400023. The next prime is 12442400107. The reversal of 12442400077 is 77000424421.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10770080841 + 1672319236 = 103779^2 + 40894^2 .

It is a cyclic number.

It is not a de Polignac number, because 12442400077 - 2¹⁵ = 12442367309 is a prime.

It is a super-2 number, since 2×12442400077² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12442470077) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6221200038 + 6221200039.

It is an arithmetic number, because the mean of its divisors is an integer number (6221200039).

Almost surely, 2^12442400077 is an apocalyptic number.

It is an amenable number.

12442400077 is a deficient number, since it is larger than the sum of its proper divisors (1).

12442400077 is an equidigital number, since it uses as much as digits as its factorization.

12442400077 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12544, while the sum is 31.

Adding to 12442400077 its reverse (77000424421), we get a palindrome (89442824498).

The spelling of 12442400077 in words is "twelve billion, four hundred forty-two million, four hundred thousand, seventy-seven".