20501571011667 has 4 divisors (see below), whose sum is σ = 27335428015560. Its totient is φ = 13667714007776.

The previous prime is 20501571011659. The next prime is 20501571011737. The reversal of 20501571011667 is 76611017510502.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20501571011667 - 2³ = 20501571011659 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20501570011667) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3416928501942 + ... + 3416928501947.

It is an arithmetic number, because the mean of its divisors is an integer number (6833857003890).

Almost surely, 2^{20501571011667} is an apocalyptic number.

20501571011667 is a deficient number, since it is larger than the sum of its proper divisors (6833857003893).

20501571011667 is an equidigital number, since it uses as much as digits as its factorization.

20501571011667 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6833857003892.

The product of its (nonzero) digits is 88200, while the sum is 42.

The spelling of 20501571011667 in words is "twenty trillion, five hundred one billion, five hundred seventy-one million, eleven thousand, six hundred sixty-seven".