1861149696 has 352 divisors, whose sum is σ = 6112309248. Its totient is φ = 492011520.

The previous prime is 1861149683. The next prime is 1861149701. The reversal of 1861149696 is 6969411681.

It is a Smith number, since the sum of its digits (51) coincides with the sum of the digits of its prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 26213341 + ... + 26213411.

Almost surely, 2^1861149696 is an apocalyptic number.

1861149696 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1861149696, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3056154624).

1861149696 is an abundant number, since it is smaller than the sum of its proper divisors (4251159552).

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

1861149696 is a wasteful number, since it uses less digits than its factorization.

1861149696 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 177 (or 159 counting only the distinct ones).

The product of its digits is 559872, while the sum is 51.

The square root of 1861149696 is about 43141.0442154568. The cubic root of 1861149696 is about 1230.0622825227.

The spelling of 1861149696 in words is "one billion, eight hundred sixty-one million, one hundred forty-nine thousand, six hundred ninety-six".