42155156557 has 2 divisors, whose sum is σ = 42155156558. Its totient is φ = 42155156556.

The previous prime is 42155156507. The next prime is 42155156623. The reversal of 42155156557 is 75565155124.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 40644979236 + 1510177321 = 201606^2 + 38861^2 .

It is a cyclic number.

It is not a de Polignac number, because 42155156557 - 2¹⁹ = 42154632269 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42155156507) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21077578278 + 21077578279.

It is an arithmetic number, because the mean of its divisors is an integer number (21077578279).

Almost surely, 2^42155156557 is an apocalyptic number.

It is an amenable number.

42155156557 is a deficient number, since it is larger than the sum of its proper divisors (1).

42155156557 is an equidigital number, since it uses as much as digits as its factorization.

42155156557 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1050000, while the sum is 46.

The spelling of 42155156557 in words is "forty-two billion, one hundred fifty-five million, one hundred fifty-six thousand, five hundred fifty-seven".