42660149891 has 2 divisors, whose sum is σ = 42660149892. Its totient is φ = 42660149890.

The previous prime is 42660149837. The next prime is 42660149927. The reversal of 42660149891 is 19894106624.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-42660149891 is a prime.

It is not a weakly prime, because it can be changed into another prime (42660119891) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21330074945 + 21330074946.

It is an arithmetic number, because the mean of its divisors is an integer number (21330074946).

Almost surely, 2^42660149891 is an apocalyptic number.

42660149891 is a deficient number, since it is larger than the sum of its proper divisors (1).

42660149891 is an equidigital number, since it uses as much as digits as its factorization.

42660149891 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 746496, while the sum is 50.

The spelling of 42660149891 in words is "forty-two billion, six hundred sixty million, one hundred forty-nine thousand, eight hundred ninety-one".