121520516066 has 16 divisors (see below), whose sum is σ = 187071865848. Its totient is φ = 59168707200.

The previous prime is 121520516023. The next prime is 121520516071. The reversal of 121520516066 is 660615025121.

It can be written as a sum of positive squares in 4 ways, for example, as 47792518225 + 73727997841 = 218615^2 + 271529^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1325285 + ... + 1414008.

Almost surely, 2^121520516066 is an apocalyptic number.

121520516066 is a deficient number, since it is larger than the sum of its proper divisors (65551349782).

121520516066 is a wasteful number, since it uses less digits than its factorization.

121520516066 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2739877.

The product of its (nonzero) digits is 21600, while the sum is 35.

The spelling of 121520516066 in words is "one hundred twenty-one billion, five hundred twenty million, five hundred sixteen thousand, sixty-six".