56001038671891 has 2 divisors, whose sum is σ = 56001038671892. Its totient is φ = 56001038671890.

The previous prime is 56001038671859. The next prime is 56001038671969. The reversal of 56001038671891 is 19817683010065.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 56001038671891 - 2⁵ = 56001038671859 is a prime.

It is a super-2 number, since 2×56001038671891² (a number of 28 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (56001038671811) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28000519335945 + 28000519335946.

It is an arithmetic number, because the mean of its divisors is an integer number (28000519335946).

Almost surely, 2^{56001038671891} is an apocalyptic number.

56001038671891 is a deficient number, since it is larger than the sum of its proper divisors (1).

56001038671891 is an equidigital number, since it uses as much as digits as its factorization.

56001038671891 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2177280, while the sum is 55.

The spelling of 56001038671891 in words is "fifty-six trillion, one billion, thirty-eight million, six hundred seventy-one thousand, eight hundred ninety-one".