165783511263 has 4 divisors (see below), whose sum is σ = 221044681688. Its totient is φ = 110522340840.

The previous prime is 165783511253. The next prime is 165783511291. The reversal of 165783511263 is 362115387561.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 362115387561 = 3 ⋅120705129187.

It is not a de Polignac number, because 165783511263 - 2⁸ = 165783511007 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165783511253) 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, 27630585208 + ... + 27630585213.

It is an arithmetic number, because the mean of its divisors is an integer number (55261170422).

Almost surely, 2^165783511263 is an apocalyptic number.

165783511263 is a deficient number, since it is larger than the sum of its proper divisors (55261170425).

165783511263 is an equidigital number, since it uses as much as digits as its factorization.

165783511263 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55261170424.

The product of its digits is 907200, while the sum is 48.

The spelling of 165783511263 in words is "one hundred sixty-five billion, seven hundred eighty-three million, five hundred eleven thousand, two hundred sixty-three".