42157576891 has 2 divisors, whose sum is σ = 42157576892. Its totient is φ = 42157576890.

The previous prime is 42157576849. The next prime is 42157576897. The reversal of 42157576891 is 19867575124.

42157576891 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 42157576891 - 2⁷ = 42157576763 is a prime.

It is a super-2 number, since 2×42157576891² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (42157576897) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21078788445 + 21078788446.

It is an arithmetic number, because the mean of its divisors is an integer number (21078788446).

Almost surely, 2^42157576891 is an apocalyptic number.

42157576891 is a deficient number, since it is larger than the sum of its proper divisors (1).

42157576891 is an equidigital number, since it uses as much as digits as its factorization.

42157576891 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4233600, while the sum is 55.

The spelling of 42157576891 in words is "forty-two billion, one hundred fifty-seven million, five hundred seventy-six thousand, eight hundred ninety-one".