1661464505 has 8 divisors (see below), whose sum is σ = 1994025600. Its totient is φ = 1328992816.

The previous prime is 1661464477. The next prime is 1661464531. The reversal of 1661464505 is 5054641661.

It is a happy number.

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 1661464505 - 2²² = 1657270201 is a prime.

It is an unprimeable number.

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, 29456 + ... + 64734.

It is an arithmetic number, because the mean of its divisors is an integer number (249253200).

Almost surely, 2^1661464505 is an apocalyptic number.

It is an amenable number.

1661464505 is a deficient number, since it is larger than the sum of its proper divisors (332561095).

1661464505 is an equidigital number, since it uses as much as digits as its factorization.

1661464505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44703.

The product of its (nonzero) digits is 86400, while the sum is 38.

The square root of 1661464505 is about 40761.0660434685. The cubic root of 1661464505 is about 1184.3962468881.

The spelling of 1661464505 in words is "one billion, six hundred sixty-one million, four hundred sixty-four thousand, five hundred five".