15109799661685 has 8 divisors (see below), whose sum is σ = 19198333687896. Its totient is φ = 11376790333440.

The previous prime is 15109799661683. The next prime is 15109799661713. The reversal of 15109799661685 is 58616699790151.

It can be written as a sum of positive squares in 4 ways, for example, as 5036653574001 + 10073146087684 = 2244249^2 + 3173822^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 15109799661685 - 2¹ = 15109799661683 is a prime.

It is a super-2 number, since 2×15109799661685² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15109799661683) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 88881174396 + ... + 88881174565.

It is an arithmetic number, because the mean of its divisors is an integer number (2399791710987).

Almost surely, 2^{15109799661685} is an apocalyptic number.

It is an amenable number.

15109799661685 is a deficient number, since it is larger than the sum of its proper divisors (4088534026211).

15109799661685 is a wasteful number, since it uses less digits than its factorization.

15109799661685 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 177762348983.

The product of its (nonzero) digits is 220449600, while the sum is 73.

The spelling of 15109799661685 in words is "fifteen trillion, one hundred nine billion, seven hundred ninety-nine million, six hundred sixty-one thousand, six hundred eighty-five".