1660561920548 has 6 divisors (see below), whose sum is σ = 2905983360966. Its totient is φ = 830280960272.

The previous prime is 1660561920539. The next prime is 1660561920553. The reversal of 1660561920548 is 8450291650661.

It can be written as a sum of positive squares in only one way, i.e., 1458761515264 + 201800405284 = 1207792^2 + 449222^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 1660561920548.

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 as a sum of consecutive naturals, namely, 207570240065 + ... + 207570240072.

It is an arithmetic number, because the mean of its divisors is an integer number (484330560161).

Almost surely, 2^{1660561920548} is an apocalyptic number.

It is an amenable number.

1660561920548 is a deficient number, since it is larger than the sum of its proper divisors (1245421440418).

1660561920548 is a wasteful number, since it uses less digits than its factorization.

1660561920548 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 415140480141 (or 415140480139 counting only the distinct ones).

The product of its (nonzero) digits is 3110400, while the sum is 53.

The spelling of 1660561920548 in words is "one trillion, six hundred sixty billion, five hundred sixty-one million, nine hundred twenty thousand, five hundred forty-eight".