42974155561 has 2 divisors, whose sum is σ = 42974155562. Its totient is φ = 42974155560.

The previous prime is 42974155547. The next prime is 42974155577. The reversal of 42974155561 is 16555147924.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 29358766336 + 13615389225 = 171344^2 + 116685^2 .

It is a cyclic number.

It is not a de Polignac number, because 42974155561 - 2⁵ = 42974155529 is a prime.

It is not a weakly prime, because it can be changed into another prime (42974155061) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21487077780 + 21487077781.

It is an arithmetic number, because the mean of its divisors is an integer number (21487077781).

Almost surely, 2^42974155561 is an apocalyptic number.

It is an amenable number.

42974155561 is a deficient number, since it is larger than the sum of its proper divisors (1).

42974155561 is an equidigital number, since it uses as much as digits as its factorization.

42974155561 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1512000, while the sum is 49.

The spelling of 42974155561 in words is "forty-two billion, nine hundred seventy-four million, one hundred fifty-five thousand, five hundred sixty-one".