1861405459852 has 12 divisors (see below), whose sum is σ = 3259641386736. Its totient is φ = 930079349360.

The previous prime is 1861405459819. The next prime is 1861405459853. The reversal of 1861405459852 is 2589545041681.

It is not an unprimeable number, because it can be changed into a prime (1861405459853) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 155838424 + ... + 155850367.

It is an arithmetic number, because the mean of its divisors is an integer number (271636782228).

Almost surely, 2^{1861405459852} is an apocalyptic number.

It is an amenable number.

1861405459852 is a deficient number, since it is larger than the sum of its proper divisors (1398235926884).

1861405459852 is a wasteful number, since it uses less digits than its factorization.

1861405459852 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 311690288 (or 311690286 counting only the distinct ones).

The product of its (nonzero) digits is 13824000, while the sum is 58.

The spelling of 1861405459852 in words is "one trillion, eight hundred sixty-one billion, four hundred five million, four hundred fifty-nine thousand, eight hundred fifty-two".