165606610651 has 4 divisors (see below), whose sum is σ = 167072155992. Its totient is φ = 164141065312.

The previous prime is 165606610633. The next prime is 165606610667. The reversal of 165606610651 is 156016606561.

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 165606610651 - 2¹¹ = 165606608603 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 165606610598 and 165606610607.

It is not an unprimeable number, because it can be changed into a prime (165606610621) 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, 732772501 + ... + 732772726.

It is an arithmetic number, because the mean of its divisors is an integer number (41768038998).

Almost surely, 2^165606610651 is an apocalyptic number.

165606610651 is a deficient number, since it is larger than the sum of its proper divisors (1465545341).

165606610651 is a wasteful number, since it uses less digits than its factorization.

165606610651 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1465545340.

The product of its (nonzero) digits is 194400, while the sum is 43.

The spelling of 165606610651 in words is "one hundred sixty-five billion, six hundred six million, six hundred ten thousand, six hundred fifty-one".