766637161 has 4 divisors (see below), whose sum is σ = 791367424. Its totient is φ = 741906900.

The previous prime is 766637159. The next prime is 766637227. The reversal of 766637161 is 161736667.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 161736667 = 23 ⋅7032029.

It is a cyclic number.

It is not a de Polignac number, because 766637161 - 2¹ = 766637159 is a prime.

It is a super-2 number, since 2×766637161² = 1175465073252279842, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (766637101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12365085 + ... + 12365146.

It is an arithmetic number, because the mean of its divisors is an integer number (197841856).

Almost surely, 2^766637161 is an apocalyptic number.

It is an amenable number.

766637161 is a deficient number, since it is larger than the sum of its proper divisors (24730263).

766637161 is a wasteful number, since it uses less digits than its factorization.

766637161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24730262.

The product of its digits is 190512, while the sum is 43.

The square root of 766637161 is about 27688.2133948726. The cubic root of 766637161 is about 915.2293853912.

The spelling of 766637161 in words is "seven hundred sixty-six million, six hundred thirty-seven thousand, one hundred sixty-one".