291985549066 has 16 divisors (see below), whose sum is σ = 444012985224. Its totient is φ = 143981535744.

The previous prime is 291985549013. The next prime is 291985549067. The reversal of 291985549066 is 660945589192.

It can be written as a sum of positive squares in 4 ways, for example, as 282302005041 + 9683544025 = 531321^2 + 98405^2 .

It is a junction number, because it is equal to n+sod(n) for n = 291985548989 and 291985549007.

It is not an unprimeable number, because it can be changed into a prime (291985549067) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1962450 + ... + 2105986.

Almost surely, 2^291985549066 is an apocalyptic number.

291985549066 is a deficient number, since it is larger than the sum of its proper divisors (152027436158).

291985549066 is a wasteful number, since it uses less digits than its factorization.

291985549066 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 157545.

The product of its (nonzero) digits is 41990400, while the sum is 64.

The spelling of 291985549066 in words is "two hundred ninety-one billion, nine hundred eighty-five million, five hundred forty-nine thousand, sixty-six".