40172997827 has 2 divisors, whose sum is σ = 40172997828. Its totient is φ = 40172997826.

The previous prime is 40172997803. The next prime is 40172997829. The reversal of 40172997827 is 72879927104.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 40172997827 - 2²⁸ = 39904562371 is a prime.

It is a super-2 number, since 2×40172997827² (a number of 22 digits) contains 22 as substring.

Together with 40172997829, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (40172997829) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20086498913 + 20086498914.

It is an arithmetic number, because the mean of its divisors is an integer number (20086498914).

Almost surely, 2^40172997827 is an apocalyptic number.

40172997827 is a deficient number, since it is larger than the sum of its proper divisors (1).

40172997827 is an equidigital number, since it uses as much as digits as its factorization.

40172997827 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3556224, while the sum is 56.

The spelling of 40172997827 in words is "forty billion, one hundred seventy-two million, nine hundred ninety-seven thousand, eight hundred twenty-seven".