165005551610 has 8 divisors (see below), whose sum is σ = 297009992916. Its totient is φ = 66002220640.

The previous prime is 165005551597. The next prime is 165005551643. The reversal of 165005551610 is 16155500561.

It can be written as a sum of positive squares in 2 ways, for example, as 159623421841 + 5382129769 = 399529^2 + 73363^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8250277571 + ... + 8250277590.

Almost surely, 2^165005551610 is an apocalyptic number.

165005551610 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

165005551610 is a deficient number, since it is larger than the sum of its proper divisors (132004441306).

165005551610 is a wasteful number, since it uses less digits than its factorization.

165005551610 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16500555168.

The product of its (nonzero) digits is 22500, while the sum is 35.

The spelling of 165005551610 in words is "one hundred sixty-five billion, five million, five hundred fifty-one thousand, six hundred ten".