1661863196 has 24 divisors (see below), whose sum is σ = 3498660480. Its totient is φ = 674741232.

The previous prime is 1661863193. The next prime is 1661863201. The reversal of 1661863196 is 6913681661.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 1661863196.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1661863193) 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, 1561370 + ... + 1562433.

It is an arithmetic number, because the mean of its divisors is an integer number (145777520).

Almost surely, 2^1661863196 is an apocalyptic number.

It is an amenable number.

1661863196 is an abundant number, since it is smaller than the sum of its proper divisors (1836797284).

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

1661863196 is a wasteful number, since it uses less digits than its factorization.

1661863196 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3123833 (or 3123831 counting only the distinct ones).

The product of its digits is 279936, while the sum is 47.

The square root of 1661863196 is about 40765.9563361391. The cubic root of 1661863196 is about 1184.4909766394.

The spelling of 1661863196 in words is "one billion, six hundred sixty-one million, eight hundred sixty-three thousand, one hundred ninety-six".