1661518434 has 8 divisors (see below), whose sum is σ = 3323036880. Its totient is φ = 553839476.

The previous prime is 1661518421. The next prime is 1661518447. The reversal of 1661518434 is 4348151661.

It is an interprime number because it is at equal distance from previous prime (1661518421) and next prime (1661518447).

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

1661518434 is an admirable number.

It is a junction number, because it is equal to n+sod(n) for n = 1661518392 and 1661518401.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 138459864 + ... + 138459875.

It is an arithmetic number, because the mean of its divisors is an integer number (415379610).

Almost surely, 2^1661518434 is an apocalyptic number.

1661518434 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

1661518434 is a wasteful number, since it uses less digits than its factorization.

1661518434 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 276919744.

The product of its digits is 69120, while the sum is 39.

The square root of 1661518434 is about 40761.7275639784. The cubic root of 1661518434 is about 1184.4090614088.

The spelling of 1661518434 in words is "one billion, six hundred sixty-one million, five hundred eighteen thousand, four hundred thirty-four".