40187824578991 has 2 divisors, whose sum is σ = 40187824578992. Its totient is φ = 40187824578990.

The previous prime is 40187824578971. The next prime is 40187824579051. The reversal of 40187824578991 is 19987542878104.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 40187824578991 - 2⁵ = 40187824578959 is a prime.

It is a super-2 number, since 2×40187824578991² (a number of 28 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40187824578971) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20093912289495 + 20093912289496.

It is an arithmetic number, because the mean of its divisors is an integer number (20093912289496).

Almost surely, 2^{40187824578991} is an apocalyptic number.

40187824578991 is a deficient number, since it is larger than the sum of its proper divisors (1).

40187824578991 is an equidigital number, since it uses as much as digits as its factorization.

40187824578991 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 325140480, while the sum is 73.

The spelling of 40187824578991 in words is "forty trillion, one hundred eighty-seven billion, eight hundred twenty-four million, five hundred seventy-eight thousand, nine hundred ninety-one".