261400104437 has 2 divisors, whose sum is σ = 261400104438. Its totient is φ = 261400104436.

The previous prime is 261400104421. The next prime is 261400104443. The reversal of 261400104437 is 734401004162.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 244153586161 + 17246518276 = 494119^2 + 131326^2 .

It is a cyclic number.

It is not a de Polignac number, because 261400104437 - 2⁴ = 261400104421 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (261400104487) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130700052218 + 130700052219.

It is an arithmetic number, because the mean of its divisors is an integer number (130700052219).

Almost surely, 2^261400104437 is an apocalyptic number.

It is an amenable number.

261400104437 is a deficient number, since it is larger than the sum of its proper divisors (1).

261400104437 is an equidigital number, since it uses as much as digits as its factorization.

261400104437 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 16128, while the sum is 32.

Adding to 261400104437 its reverse (734401004162), we get a palindrome (995801108599).

The spelling of 261400104437 in words is "two hundred sixty-one billion, four hundred million, one hundred four thousand, four hundred thirty-seven".