20217052151565 has 16 divisors (see below), whose sum is σ = 33136241576256. Its totient is φ = 10519441769600.

The previous prime is 20217052151539. The next prime is 20217052151617. The reversal of 20217052151565 is 56515125071202.

It is not a de Polignac number, because 20217052151565 - 2⁵ = 20217052151533 is a prime.

It is a congruent number.

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, 16436627151 + ... + 16436628380.

It is an arithmetic number, because the mean of its divisors is an integer number (2071015098516).

Almost surely, 2^{20217052151565} is an apocalyptic number.

It is an amenable number.

20217052151565 is a deficient number, since it is larger than the sum of its proper divisors (12919189424691).

20217052151565 is a wasteful number, since it uses less digits than its factorization.

20217052151565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32873255580.

The product of its (nonzero) digits is 210000, while the sum is 42.

The spelling of 20217052151565 in words is "twenty trillion, two hundred seventeen billion, fifty-two million, one hundred fifty-one thousand, five hundred sixty-five".