40108621157909 has 2 divisors, whose sum is σ = 40108621157910. Its totient is φ = 40108621157908.

The previous prime is 40108621157867. The next prime is 40108621157921. The reversal of 40108621157909 is 90975112680104.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 28895967997009 + 11212653160900 = 5375497^2 + 3348530^2 .

It is a cyclic number.

It is not a de Polignac number, because 40108621157909 - 2²⁰ = 40108620109333 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40108621157509) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20054310578954 + 20054310578955.

It is an arithmetic number, because the mean of its divisors is an integer number (20054310578955).

Almost surely, 2^{40108621157909} is an apocalyptic number.

It is an amenable number.

40108621157909 is a deficient number, since it is larger than the sum of its proper divisors (1).

40108621157909 is an equidigital number, since it uses as much as digits as its factorization.

40108621157909 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1088640, while the sum is 53.

The spelling of 40108621157909 in words is "forty trillion, one hundred eight billion, six hundred twenty-one million, one hundred fifty-seven thousand, nine hundred nine".