1661333250 has 32 divisors (see below), whose sum is σ = 4146689664. Its totient is φ = 443022000.

The previous prime is 1661333249. The next prime is 1661333287. The reversal of 1661333250 is 523331661.

It is a happy number.

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

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, 1106806 + ... + 1108305.

It is an arithmetic number, because the mean of its divisors is an integer number (129584052).

Almost surely, 2^1661333250 is an apocalyptic number.

1661333250 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1661333250 is an abundant number, since it is smaller than the sum of its proper divisors (2485356414).

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

1661333250 is a wasteful number, since it uses less digits than its factorization.

1661333250 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2215131 (or 2215121 counting only the distinct ones).

The product of its (nonzero) digits is 9720, while the sum is 30.

The square root of 1661333250 is about 40759.4559580964. The cubic root of 1661333250 is about 1184.3650571309.

The spelling of 1661333250 in words is "one billion, six hundred sixty-one million, three hundred thirty-three thousand, two hundred fifty".