40154432509 has 2 divisors, whose sum is σ = 40154432510. Its totient is φ = 40154432508.

The previous prime is 40154432491. The next prime is 40154432519. The reversal of 40154432509 is 90523445104.

It is a happy number.

40154432509 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 33958381284 + 6196051225 = 184278^2 + 78715^2 .

It is a cyclic number.

It is not a de Polignac number, because 40154432509 - 2²¹ = 40152335357 is a prime.

It is a super-2 number, since 2×40154432509² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40154432519) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20077216254 + 20077216255.

It is an arithmetic number, because the mean of its divisors is an integer number (20077216255).

Almost surely, 2^40154432509 is an apocalyptic number.

It is an amenable number.

40154432509 is a deficient number, since it is larger than the sum of its proper divisors (1).

40154432509 is an equidigital number, since it uses as much as digits as its factorization.

40154432509 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 86400, while the sum is 37.

The spelling of 40154432509 in words is "forty billion, one hundred fifty-four million, four hundred thirty-two thousand, five hundred nine".