1661425012 has 12 divisors (see below), whose sum is σ = 3131147236. Its totient is φ = 766811520.

The previous prime is 1661425009. The next prime is 1661425019. The reversal of 1661425012 is 2105241661.

It can be written as a sum of positive squares in 2 ways, for example, as 1050148836 + 611276176 = 32406^2 + 24724^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1661425019) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15975189 + ... + 15975292.

Almost surely, 2^1661425012 is an apocalyptic number.

It is an amenable number.

1661425012 is a deficient number, since it is larger than the sum of its proper divisors (1469722224).

1661425012 is a wasteful number, since it uses less digits than its factorization.

1661425012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31950498 (or 31950496 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 28.

The square root of 1661425012 is about 40760.5815954581. The cubic root of 1661425012 is about 1184.3868624501.

Adding to 1661425012 its reverse (2105241661), we get a palindrome (3766666673).

The spelling of 1661425012 in words is "one billion, six hundred sixty-one million, four hundred twenty-five thousand, twelve".