20511552051345 has 16 divisors (see below), whose sum is σ = 32819918769792. Its totient is φ = 10939015931520.

The previous prime is 20511552051271. The next prime is 20511552051359. The reversal of 20511552051345 is 54315025511502.

It is not a de Polignac number, because 20511552051345 - 2²⁵ = 20511518496913 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 29551492 + ... + 30237621.

It is an arithmetic number, because the mean of its divisors is an integer number (2051244923112).

Almost surely, 2^{20511552051345} is an apocalyptic number.

It is an amenable number.

20511552051345 is a deficient number, since it is larger than the sum of its proper divisors (12308366718447).

20511552051345 is a wasteful number, since it uses less digits than its factorization.

20511552051345 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 59811992.

The product of its (nonzero) digits is 150000, while the sum is 39.

Adding to 20511552051345 its reverse (54315025511502), we get a palindrome (74826577562847).

The spelling of 20511552051345 in words is "twenty trillion, five hundred eleven billion, five hundred fifty-two million, fifty-one thousand, three hundred forty-five".