166316761 has 4 divisors (see below), whose sum is σ = 179110372. Its totient is φ = 153523152.

The previous prime is 166316723. The next prime is 166316783. The reversal of 166316761 is 167613661.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 167613661 = 2029 ⋅82609.

It can be written as a sum of positive squares in 2 ways, for example, as 32775625 + 133541136 = 5725^2 + 11556^2 .

It is a cyclic number.

It is not a de Polignac number, because 166316761 - 2¹¹ = 166314713 is a prime.

It is a super-2 number, since 2×166316761² = 55322529979062242, which contains 22 as substring.

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 166316761.

It is not an unprimeable number, because it can be changed into a prime (166316701) 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, 6396786 + ... + 6396811.

It is an arithmetic number, because the mean of its divisors is an integer number (44777593).

Almost surely, 2^166316761 is an apocalyptic number.

It is an amenable number.

166316761 is a deficient number, since it is larger than the sum of its proper divisors (12793611).

166316761 is a wasteful number, since it uses less digits than its factorization.

166316761 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12793610.

The product of its digits is 27216, while the sum is 37.

The square root of 166316761 is about 12896.3855789132. The cubic root of 166316761 is about 549.9358173038.

The spelling of 166316761 in words is "one hundred sixty-six million, three hundred sixteen thousand, seven hundred sixty-one".