1661445300 has 72 divisors (see below), whose sum is σ = 4909435776. Its totient is φ = 433621760.

The previous prime is 1661445283. The next prime is 1661445307. The reversal of 1661445300 is 35441661.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1661445307) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 44817 + ... + 73016.

It is an arithmetic number, because the mean of its divisors is an integer number (68186608).

Almost surely, 2^1661445300 is an apocalyptic number.

1661445300 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1661445300 is an abundant number, since it is smaller than the sum of its proper divisors (3247990476).

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

1661445300 is a wasteful number, since it uses less digits than its factorization.

1661445300 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 117897 (or 117890 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 30.

The square root of 1661445300 is about 40760.8304625899. The cubic root of 1661445300 is about 1184.3916833604.

Adding to 1661445300 its reverse (35441661), we get a palindrome (1696886961).

The spelling of 1661445300 in words is "one billion, six hundred sixty-one million, four hundred forty-five thousand, three hundred".