121385374666 has 4 divisors (see below), whose sum is σ = 182078062002. Its totient is φ = 60692687332.

The previous prime is 121385374661. The next prime is 121385374679. The reversal of 121385374666 is 666473583121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 666473583121 = 941 ⋅708260981.

It can be written as a sum of positive squares in only one way, i.e., 102704225625 + 18681149041 = 320475^2 + 136679^2 .

It is a super-2 number, since 2×121385374666² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (121385374661) 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 as a sum of consecutive naturals, namely, 30346343665 + ... + 30346343668.

Almost surely, 2^121385374666 is an apocalyptic number.

121385374666 is a deficient number, since it is larger than the sum of its proper divisors (60692687336).

121385374666 is an equidigital number, since it uses as much as digits as its factorization.

121385374666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60692687335.

The product of its digits is 4354560, while the sum is 52.

The spelling of 121385374666 in words is "one hundred twenty-one billion, three hundred eighty-five million, three hundred seventy-four thousand, six hundred sixty-six".