42906272561 has 2 divisors, whose sum is σ = 42906272562. Its totient is φ = 42906272560.

The previous prime is 42906272557. The next prime is 42906272611. The reversal of 42906272561 is 16527260924.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 32391000625 + 10515271936 = 179975^2 + 102544^2 .

It is a cyclic number.

It is not a de Polignac number, because 42906272561 - 2² = 42906272557 is a prime.

It is not a weakly prime, because it can be changed into another prime (42906272161) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21453136280 + 21453136281.

It is an arithmetic number, because the mean of its divisors is an integer number (21453136281).

Almost surely, 2^42906272561 is an apocalyptic number.

It is an amenable number.

42906272561 is a deficient number, since it is larger than the sum of its proper divisors (1).

42906272561 is an equidigital number, since it uses as much as digits as its factorization.

42906272561 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 362880, while the sum is 44.

The spelling of 42906272561 in words is "forty-two billion, nine hundred six million, two hundred seventy-two thousand, five hundred sixty-one".