212661623661066 has 12 divisors (see below), whose sum is σ = 460766851265682. Its totient is φ = 70887207887016.

The previous prime is 212661623661049. The next prime is 212661623661131. The reversal of 212661623661066 is 660166326166212.

212661623661066 is a `hidden beast` number, since 2 + 1 + 2 + 6 + 6 + 1 + 623 + 6 + 6 + 1 + 0 + 6 + 6 = 666.

It can be written as a sum of positive squares in only one way, i.e., 126450677210841 + 86210946450225 = 11245029^2 + 9284985^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 5907267323901 + ... + 5907267323936.

Almost surely, 2^{212661623661066} is an apocalyptic number.

212661623661066 is an abundant number, since it is smaller than the sum of its proper divisors (248105227604616).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

212661623661066 is a wasteful number, since it uses less digits than its factorization.

212661623661066 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11814534647845 (or 11814534647842 counting only the distinct ones).

The product of its (nonzero) digits is 6718464, while the sum is 54.

The spelling of 212661623661066 in words is "two hundred twelve trillion, six hundred sixty-one billion, six hundred twenty-three million, six hundred sixty-one thousand, sixty-six".