109157439971985 has 32 divisors (see below), whose sum is σ = 184962959101440. Its totient is φ = 54781668630528.

The previous prime is 109157439971939. The next prime is 109157439972041. The reversal of 109157439971985 is 589179934751901.

It is not a de Polignac number, because 109157439971985 - 2¹⁹ = 109157439447697 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 109157439971985.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 42040000 + ... + 44560929.

It is an arithmetic number, because the mean of its divisors is an integer number (5780092471920).

Almost surely, 2^{109157439971985} is an apocalyptic number.

109157439971985 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

109157439971985 is a deficient number, since it is larger than the sum of its proper divisors (75805519129455).

109157439971985 is a wasteful number, since it uses less digits than its factorization.

109157439971985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 86605897.

The product of its (nonzero) digits is 771573600, while the sum is 78.

The spelling of 109157439971985 in words is "one hundred nine trillion, one hundred fifty-seven billion, four hundred thirty-nine million, nine hundred seventy-one thousand, nine hundred eighty-five".