165801771008 has 30 divisors (see below), whose sum is σ = 331593455046. Its totient is φ = 82900877312.

The previous prime is 165801771007. The next prime is 165801771043. The reversal of 165801771008 is 800177108561.

It can be written as a sum of positive squares in only one way, i.e., 165265014784 + 536756224 = 406528^2 + 23168^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 165801771008.

It is not an unprimeable number, because it can be changed into a prime (165801771007) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5043485 + ... + 5076252.

Almost surely, 2^165801771008 is an apocalyptic number.

It is an amenable number.

165801771008 is a deficient number, since it is larger than the sum of its proper divisors (165791684038).

165801771008 is an frugal number, since it uses more digits than its factorization.

165801771008 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10119765 (or 10119739 counting only the distinct ones).

The product of its (nonzero) digits is 94080, while the sum is 44.

Adding to 165801771008 its reverse (800177108561), we get a palindrome (965978879569).

The spelling of 165801771008 in words is "one hundred sixty-five billion, eight hundred one million, seven hundred seventy-one thousand, eight".