1656161642 has 8 divisors (see below), whose sum is σ = 2485088100. Its totient is φ = 827798944.

The previous prime is 1656161629. The next prime is 1656161653. The reversal of 1656161642 is 2461616561.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 1468499041 + 187662601 = 38321^2 + 13699^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 1656161596 and 1656161605.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 133517 + ... + 145392.

Almost surely, 2^1656161642 is an apocalyptic number.

1656161642 is a deficient number, since it is larger than the sum of its proper divisors (828926458).

1656161642 is a wasteful number, since it uses less digits than its factorization.

1656161642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 281880.

The product of its digits is 51840, while the sum is 38.

The square root of 1656161642 is about 40695.9659180121. The cubic root of 1656161642 is about 1183.1348326609.

The spelling of 1656161642 in words is "one billion, six hundred fifty-six million, one hundred sixty-one thousand, six hundred forty-two".