20215551504159 has 24 divisors (see below), whose sum is σ = 31991524383312. Its totient is φ = 12199266337920.

The previous prime is 20215551504157. The next prime is 20215551504167. The reversal of 20215551504159 is 95140515551202.

20215551504159 is a `hidden beast` number, since 2 + 0 + 2 + 1 + 5 + 551 + 5 + 0 + 41 + 59 = 666.

It is not a de Polignac number, because 20215551504159 - 2¹ = 20215551504157 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20215551504157) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 438168972 + ... + 438215105.

It is an arithmetic number, because the mean of its divisors is an integer number (1332980182638).

Almost surely, 2^{20215551504159} is an apocalyptic number.

20215551504159 is a deficient number, since it is larger than the sum of its proper divisors (11775972879153).

20215551504159 is a wasteful number, since it uses less digits than its factorization.

20215551504159 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 876384327 (or 876384324 counting only the distinct ones).

The product of its (nonzero) digits is 450000, while the sum is 45.

The spelling of 20215551504159 in words is "twenty trillion, two hundred fifteen billion, five hundred fifty-one million, five hundred four thousand, one hundred fifty-nine".