1661204270 has 16 divisors (see below), whose sum is σ = 3262001328. Its totient is φ = 604074240.

The previous prime is 1661204263. The next prime is 1661204287. The reversal of 1661204270 is 724021661.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7550819 + ... + 7551038.

It is an arithmetic number, because the mean of its divisors is an integer number (203875083).

Almost surely, 2^1661204270 is an apocalyptic number.

1661204270 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1661204270 is a deficient number, since it is larger than the sum of its proper divisors (1600797058).

1661204270 is a wasteful number, since it uses less digits than its factorization.

1661204270 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15101875.

The product of its (nonzero) digits is 4032, while the sum is 29.

The square root of 1661204270 is about 40757.8737178475. The cubic root of 1661204270 is about 1184.3344063753.

The spelling of 1661204270 in words is "one billion, six hundred sixty-one million, two hundred four thousand, two hundred seventy".