20151250806857 has 16 divisors (see below), whose sum is σ = 21372516571392. Its totient is φ = 18933979599360.

The previous prime is 20151250806853. The next prime is 20151250806859. The reversal of 20151250806857 is 75860805215102.

It is a cyclic number.

It is not a de Polignac number, because 20151250806857 - 2² = 20151250806853 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20151250806853) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 116870333 + ... + 117042629.

It is an arithmetic number, because the mean of its divisors is an integer number (1335782285712).

Almost surely, 2^{20151250806857} is an apocalyptic number.

It is an amenable number.

20151250806857 is a deficient number, since it is larger than the sum of its proper divisors (1221265764535).

20151250806857 is a wasteful number, since it uses less digits than its factorization.

20151250806857 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 183848.

The product of its (nonzero) digits is 1344000, while the sum is 50.

The spelling of 20151250806857 in words is "twenty trillion, one hundred fifty-one billion, two hundred fifty million, eight hundred six thousand, eight hundred fifty-seven".