40194685987 has 2 divisors, whose sum is σ = 40194685988. Its totient is φ = 40194685986.

The previous prime is 40194685969. The next prime is 40194686009. The reversal of 40194685987 is 78958649104.

40194685987 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 40194685987 - 2⁷ = 40194685859 is a prime.

It is a super-2 number, since 2×40194685987² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (40194685087) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20097342993 + 20097342994.

It is an arithmetic number, because the mean of its divisors is an integer number (20097342994).

Almost surely, 2^40194685987 is an apocalyptic number.

40194685987 is a deficient number, since it is larger than the sum of its proper divisors (1).

40194685987 is an equidigital number, since it uses as much as digits as its factorization.

40194685987 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 17418240, while the sum is 61.

The spelling of 40194685987 in words is "forty billion, one hundred ninety-four million, six hundred eighty-five thousand, nine hundred eighty-seven".