166260121 has 4 divisors (see below), whose sum is σ = 166390992. Its totient is φ = 166129252.

The previous prime is 166260097. The next prime is 166260137. The reversal of 166260121 is 121062661.

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.

It is a cyclic number.

It is not a de Polignac number, because 166260121 - 2¹³ = 166251929 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (166260151) 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, 63511 + ... + 66076.

It is an arithmetic number, because the mean of its divisors is an integer number (41597748).

Almost surely, 2^166260121 is an apocalyptic number.

It is an amenable number.

166260121 is a deficient number, since it is larger than the sum of its proper divisors (130871).

166260121 is a wasteful number, since it uses less digits than its factorization.

166260121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 130870.

The product of its (nonzero) digits is 864, while the sum is 25.

The square root of 166260121 is about 12894.1894278004. The cubic root of 166260121 is about 549.8733824234.

The spelling of 166260121 in words is "one hundred sixty-six million, two hundred sixty thousand, one hundred twenty-one".