161766651 has 8 divisors (see below), whose sum is σ = 216341824. Its totient is φ = 107517960.

The previous prime is 161766637. The next prime is 161766673. The reversal of 161766651 is 156667161.

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

It is not a de Polignac number, because 161766651 - 2⁹ = 161766139 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (161766251) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 80461 + ... + 82446.

It is an arithmetic number, because the mean of its divisors is an integer number (27042728).

Almost surely, 2^161766651 is an apocalyptic number.

161766651 is a deficient number, since it is larger than the sum of its proper divisors (54575173).

161766651 is a wasteful number, since it uses less digits than its factorization.

161766651 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 163241.

The product of its digits is 45360, while the sum is 39.

The square root of 161766651 is about 12718.7519434888. The cubic root of 161766651 is about 544.8743093140.

The spelling of 161766651 in words is "one hundred sixty-one million, seven hundred sixty-six thousand, six hundred fifty-one".