1661516464 has 20 divisors (see below), whose sum is σ = 3273752520. Its totient is φ = 816677120.

The previous prime is 1661516443. The next prime is 1661516477. The reversal of 1661516464 is 4646151661.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 879097 + ... + 880984.

It is an arithmetic number, because the mean of its divisors is an integer number (163687626).

Almost surely, 2^1661516464 is an apocalyptic number.

It is an amenable number.

1661516464 is a deficient number, since it is larger than the sum of its proper divisors (1612236056).

1661516464 is a wasteful number, since it uses less digits than its factorization.

1661516464 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1760148 (or 1760142 counting only the distinct ones).

The product of its digits is 103680, while the sum is 40.

The square root of 1661516464 is about 40761.7033991466. The cubic root of 1661516464 is about 1184.4085933055.

The spelling of 1661516464 in words is "one billion, six hundred sixty-one million, five hundred sixteen thousand, four hundred sixty-four".