1766806121 has 4 divisors (see below), whose sum is σ = 1827730500. Its totient is φ = 1705881744.

The previous prime is 1766806117. The next prime is 1766806127. The reversal of 1766806121 is 1216086671.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1216086671 = 24181 ⋅50291.

It can be written as a sum of positive squares in 2 ways, for example, as 970945600 + 795860521 = 31160^2 + 28211^2 .

It is a cyclic number.

It is not a de Polignac number, because 1766806121 - 2² = 1766806117 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1766806127) 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, 30462146 + ... + 30462203.

It is an arithmetic number, because the mean of its divisors is an integer number (456932625).

Almost surely, 2^1766806121 is an apocalyptic number.

It is an amenable number.

1766806121 is a deficient number, since it is larger than the sum of its proper divisors (60924379).

1766806121 is an equidigital number, since it uses as much as digits as its factorization.

1766806121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60924378.

The product of its (nonzero) digits is 24192, while the sum is 38.

The square root of 1766806121 is about 42033.3929275285. The cubic root of 1766806121 is about 1208.9164812525.

The spelling of 1766806121 in words is "one billion, seven hundred sixty-six million, eight hundred six thousand, one hundred twenty-one".