1866307826241 has 80 divisors (see below), whose sum is σ = 2893979883520. Its totient is φ = 1197834946560.

The previous prime is 1866307826237. The next prime is 1866307826249. The reversal of 1866307826241 is 1426287036681.

It is a happy number.

1866307826241 is a `hidden beast` number, since 1 + 8 + 6 + 6 + 3 + 0 + 7 + 8 + 2 + 624 + 1 = 666.

It is not a de Polignac number, because 1866307826241 - 2² = 1866307826237 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1866307826249) by changing a digit.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 73259136 + ... + 73284606.

It is an arithmetic number, because the mean of its divisors is an integer number (36174748544).

Almost surely, 2^{1866307826241} is an apocalyptic number.

It is an amenable number.

1866307826241 is a deficient number, since it is larger than the sum of its proper divisors (1027672057279).

1866307826241 is a wasteful number, since it uses less digits than its factorization.

1866307826241 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25828 (or 25819 counting only the distinct ones).

The product of its (nonzero) digits is 4644864, while the sum is 54.

The spelling of 1866307826241 in words is "one trillion, eight hundred sixty-six billion, three hundred seven million, eight hundred twenty-six thousand, two hundred forty-one".