1661467633 has 8 divisors (see below), whose sum is σ = 1901778368. Its totient is φ = 1421896464.

The previous prime is 1661467631. The next prime is 1661467649. The reversal of 1661467633 is 3367641661.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1661467633 - 2¹ = 1661467631 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1661467633.

It is not an unprimeable number, because it can be changed into a prime (1661467631) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 180066 + ... + 189067.

It is an arithmetic number, because the mean of its divisors is an integer number (237722296).

Almost surely, 2^1661467633 is an apocalyptic number.

It is an amenable number.

1661467633 is a deficient number, since it is larger than the sum of its proper divisors (240310735).

1661467633 is an equidigital number, since it uses as much as digits as its factorization.

1661467633 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 369783.

The product of its digits is 326592, while the sum is 43.

The square root of 1661467633 is about 40761.1044133988. The cubic root of 1661467633 is about 1184.3969901659.

The spelling of 1661467633 in words is "one billion, six hundred sixty-one million, four hundred sixty-seven thousand, six hundred thirty-three".