105515155551 has 8 divisors (see below), whose sum is σ = 151508941360. Its totient is φ = 64932403392.

The previous prime is 105515155519. The next prime is 105515155591. The reversal of 105515155551 is 155551515501.

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

It is not a de Polignac number, because 105515155551 - 2⁵ = 105515155519 is a prime.

It is a super-2 number, since 2×105515155551² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (39), and also a Moran number because the ratio is a prime number: 2705516809 = 105515155551 / (1 + 0 + 5 + 5 + 1 + 5 + 1 + 5 + 5 + 5 + 5 + 1).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (105515155591) 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, 1352758366 + ... + 1352758443.

It is an arithmetic number, because the mean of its divisors is an integer number (18938617670).

Almost surely, 2^105515155551 is an apocalyptic number.

105515155551 is a deficient number, since it is larger than the sum of its proper divisors (45993785809).

105515155551 is a wasteful number, since it uses less digits than its factorization.

105515155551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2705516825.

The product of its (nonzero) digits is 78125, while the sum is 39.

The spelling of 105515155551 in words is "one hundred five billion, five hundred fifteen million, one hundred fifty-five thousand, five hundred fifty-one".