1661152143 has 32 divisors (see below), whose sum is σ = 2620321792. Its totient is φ = 916012800.

The previous prime is 1661152117. The next prime is 1661152147. The reversal of 1661152143 is 3412511661.

It is a happy number.

It is not a de Polignac number, because 1661152143 - 2⁶ = 1661152079 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1661152143.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1661152147) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 239403 + ... + 246243.

It is an arithmetic number, because the mean of its divisors is an integer number (81885056).

Almost surely, 2^1661152143 is an apocalyptic number.

1661152143 is a deficient number, since it is larger than the sum of its proper divisors (959169649).

1661152143 is a wasteful number, since it uses less digits than its factorization.

1661152143 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7255.

The product of its digits is 4320, while the sum is 30.

The square root of 1661152143 is about 40757.2342412976. The cubic root of 1661152143 is about 1184.3220184857.

The spelling of 1661152143 in words is "one billion, six hundred sixty-one million, one hundred fifty-two thousand, one hundred forty-three".