1661534676 has 36 divisors (see below), whose sum is σ = 4302433044. Its totient is φ = 540336000.

The previous prime is 1661534657. The next prime is 1661534713. The reversal of 1661534676 is 6764351661.

It can be written as a sum of positive squares in 2 ways, for example, as 584382276 + 1077152400 = 24174^2 + 32820^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a congruent number.

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 11 ways as a sum of consecutive naturals, for example, 561375 + ... + 564326.

It is an arithmetic number, because the mean of its divisors is an integer number (119512029).

Almost surely, 2^1661534676 is an apocalyptic number.

It is an amenable number.

1661534676 is an abundant number, since it is smaller than the sum of its proper divisors (2640898368).

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

1661534676 is a wasteful number, since it uses less digits than its factorization.

1661534676 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1125752 (or 1125747 counting only the distinct ones).

The product of its digits is 544320, while the sum is 45.

The square root of 1661534676 is about 40761.9267944978. The cubic root of 1661534676 is about 1184.4129207520.

The spelling of 1661534676 in words is "one billion, six hundred sixty-one million, five hundred thirty-four thousand, six hundred seventy-six".