1661445250 has 32 divisors (see below), whose sum is σ = 3245463936. Its totient is φ = 635681200.

The previous prime is 1661445239. The next prime is 1661445259. The reversal of 1661445250 is 525441661.

1661445250 is digitally balanced in base 6, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (1661445259) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 138724 + ... + 150223.

It is an arithmetic number, because the mean of its divisors is an integer number (101420748).

Almost surely, 2^1661445250 is an apocalyptic number.

1661445250 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1661445250 is a deficient number, since it is larger than the sum of its proper divisors (1584018686).

1661445250 is a wasteful number, since it uses less digits than its factorization.

1661445250 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 288987 (or 288977 counting only the distinct ones).

The product of its (nonzero) digits is 28800, while the sum is 34.

The square root of 1661445250 is about 40760.8298492560. The cubic root of 1661445250 is about 1184.3916714793.

The spelling of 1661445250 in words is "one billion, six hundred sixty-one million, four hundred forty-five thousand, two hundred fifty".