201620137759 has 4 divisors (see below), whose sum is σ = 206308978216. Its totient is φ = 196931297304.

The previous prime is 201620137739. The next prime is 201620137769. The reversal of 201620137759 is 957731026102.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 957731026102 = 2 ⋅478865513051.

It is a cyclic number.

It is not a de Polignac number, because 201620137759 - 2²⁹ = 201083266847 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (43), and also a Moran number because the ratio is a prime number: 4688840413 = 201620137759 / (2 + 0 + 1 + 6 + 2 + 0 + 1 + 3 + 7 + 7 + 5 + 9).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201620137709) 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, 2344420164 + ... + 2344420249.

It is an arithmetic number, because the mean of its divisors is an integer number (51577244554).

Almost surely, 2^201620137759 is an apocalyptic number.

201620137759 is a deficient number, since it is larger than the sum of its proper divisors (4688840457).

201620137759 is an equidigital number, since it uses as much as digits as its factorization.

201620137759 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4688840456.

The product of its (nonzero) digits is 158760, while the sum is 43.

The spelling of 201620137759 in words is "two hundred one billion, six hundred twenty million, one hundred thirty-seven thousand, seven hundred fifty-nine".