1861632670812 has 24 divisors (see below), whose sum is σ = 4493596102800. Its totient is φ = 599146146816.

The previous prime is 1861632670801. The next prime is 1861632670819. The reversal of 1861632670812 is 2180762361681.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1861632670819) 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, 2674759237 + ... + 2674759932.

It is an arithmetic number, because the mean of its divisors is an integer number (187233170950).

Almost surely, 2^{1861632670812} is an apocalyptic number.

1861632670812 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1861632670812 is an abundant number, since it is smaller than the sum of its proper divisors (2631963431988).

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

1861632670812 is a wasteful number, since it uses less digits than its factorization.

1861632670812 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5349519205 (or 5349519203 counting only the distinct ones).

The product of its (nonzero) digits is 1161216, while the sum is 51.

The spelling of 1861632670812 in words is "one trillion, eight hundred sixty-one billion, six hundred thirty-two million, six hundred seventy thousand, eight hundred twelve".