2126950447561 has 2 divisors, whose sum is σ = 2126950447562. Its totient is φ = 2126950447560.

The previous prime is 2126950447537. The next prime is 2126950447577. The reversal of 2126950447561 is 1657440596212.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1537924897161 + 589025550400 = 1240131^2 + 767480^2 .

It is a cyclic number.

It is not a de Polignac number, because 2126950447561 - 2²³ = 2126942058953 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2126950447499 and 2126950447508.

It is not a weakly prime, because it can be changed into another prime (2126950447861) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1063475223780 + 1063475223781.

It is an arithmetic number, because the mean of its divisors is an integer number (1063475223781).

Almost surely, 2^{2126950447561} is an apocalyptic number.

It is an amenable number.

2126950447561 is a deficient number, since it is larger than the sum of its proper divisors (1).

2126950447561 is an equidigital number, since it uses as much as digits as its factorization.

2126950447561 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3628800, while the sum is 52.

The spelling of 2126950447561 in words is "two trillion, one hundred twenty-six billion, nine hundred fifty million, four hundred forty-seven thousand, five hundred sixty-one".