20151565715505 has 32 divisors (see below), whose sum is σ = 36865869401088. Its totient is φ = 9207821304000.

The previous prime is 20151565715471. The next prime is 20151565715509. The reversal of 20151565715505 is 50551756515102.

It is not a de Polignac number, because 20151565715505 - 2¹³ = 20151565707313 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20151565715509) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 44806671 + ... + 45254180.

It is an arithmetic number, because the mean of its divisors is an integer number (1152058418784).

Almost surely, 2^{20151565715505} is an apocalyptic number.

It is an amenable number.

20151565715505 is a deficient number, since it is larger than the sum of its proper divisors (16714303685583).

20151565715505 is a wasteful number, since it uses less digits than its factorization.

20151565715505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 90062997.

The product of its (nonzero) digits is 1312500, while the sum is 48.

The spelling of 20151565715505 in words is "twenty trillion, one hundred fifty-one billion, five hundred sixty-five million, seven hundred fifteen thousand, five hundred five".