161766451 has 16 divisors (see below), whose sum is σ = 203033088. Its totient is φ = 125208000.

The previous prime is 161766427. The next prime is 161766457. The reversal of 161766451 is 154667161.

It is a cyclic number.

It is not a de Polignac number, because 161766451 - 2¹⁵ = 161733683 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 161766451.

It is not an unprimeable number, because it can be changed into a prime (161766457) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4671 + ... + 18583.

It is an arithmetic number, because the mean of its divisors is an integer number (12689568).

Almost surely, 2^161766451 is an apocalyptic number.

161766451 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

161766451 is a deficient number, since it is larger than the sum of its proper divisors (41266637).

161766451 is a wasteful number, since it uses less digits than its factorization.

161766451 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14082.

The product of its digits is 30240, while the sum is 37.

The square root of 161766451 is about 12718.7440810797. The cubic root of 161766451 is about 544.8740847624.

The spelling of 161766451 in words is "one hundred sixty-one million, seven hundred sixty-six thousand, four hundred fifty-one".