1661506146 has 12 divisors (see below), whose sum is σ = 3599930022. Its totient is φ = 553835376.

The previous prime is 1661506141. The next prime is 1661506153. The reversal of 1661506146 is 6416051661.

It is a happy number.

1661506146 is a `hidden beast` number, since 1 + 6 + 6 + 1 + 506 + 146 = 666.

It can be written as a sum of positive squares in only one way, i.e., 1457330625 + 204175521 = 38175^2 + 14289^2 .

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 1661506146.

It is not an unprimeable number, because it can be changed into a prime (1661506141) by changing a digit.

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 5 ways as a sum of consecutive naturals, for example, 46152931 + ... + 46152966.

Almost surely, 2^1661506146 is an apocalyptic number.

1661506146 is an abundant number, since it is smaller than the sum of its proper divisors (1938423876).

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

1661506146 is a wasteful number, since it uses less digits than its factorization.

1661506146 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 92305905 (or 92305902 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 36.

The square root of 1661506146 is about 40761.5768340726. The cubic root of 1661506146 is about 1184.4061415788.

The spelling of 1661506146 in words is "one billion, six hundred sixty-one million, five hundred six thousand, one hundred forty-six".