15220675872817 has 4 divisors (see below), whose sum is σ = 15371375634036. Its totient is φ = 15069976111600.

The previous prime is 15220675872811. The next prime is 15220675872833. The reversal of 15220675872817 is 71827857602251.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 12800087553841 + 2420588318976 = 3577721^2 + 1555824^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-15220675872817 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (15220675872811) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 75349880458 + ... + 75349880659.

It is an arithmetic number, because the mean of its divisors is an integer number (3842843908509).

Almost surely, 2^{15220675872817} is an apocalyptic number.

It is an amenable number.

15220675872817 is a deficient number, since it is larger than the sum of its proper divisors (150699761219).

15220675872817 is a wasteful number, since it uses less digits than its factorization.

15220675872817 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 150699761218.

The product of its (nonzero) digits is 26342400, while the sum is 61.

The spelling of 15220675872817 in words is "fifteen trillion, two hundred twenty billion, six hundred seventy-five million, eight hundred seventy-two thousand, eight hundred seventeen".