1861780547156 has 48 divisors (see below), whose sum is σ = 3328765118784. Its totient is φ = 910804068096.

The previous prime is 1861780547147. The next prime is 1861780547189. The reversal of 1861780547156 is 6517450871681.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 1861780547095 and 1861780547104.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 254790455 + ... + 254797761.

It is an arithmetic number, because the mean of its divisors is an integer number (69349273308).

Almost surely, 2^{1861780547156} is an apocalyptic number.

It is an amenable number.

1861780547156 is a deficient number, since it is larger than the sum of its proper divisors (1466984571628).

1861780547156 is a wasteful number, since it uses less digits than its factorization.

1861780547156 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10520 (or 10518 counting only the distinct ones).

The product of its (nonzero) digits is 11289600, while the sum is 59.

The spelling of 1861780547156 in words is "one trillion, eight hundred sixty-one billion, seven hundred eighty million, five hundred forty-seven thousand, one hundred fifty-six".