2656661642 has 8 divisors (see below), whose sum is σ = 4092695076. Its totient is φ = 1292429952.

The previous prime is 2656661629. The next prime is 2656661701. The reversal of 2656661642 is 2461666562.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 2079268801 + 577392841 = 45599^2 + 24029^2 .

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 = 2656661593 and 2656661602.

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, 17950343 + ... + 17950490.

Almost surely, 2^2656661642 is an apocalyptic number.

2656661642 is a deficient number, since it is larger than the sum of its proper divisors (1436033434).

2656661642 is a wasteful number, since it uses less digits than its factorization.

2656661642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35900872.

The product of its digits is 622080, while the sum is 44.

The square root of 2656661642 is about 51542.8136795034. The cubic root of 2656661642 is about 1384.9861010739.

The spelling of 2656661642 in words is "two billion, six hundred fifty-six million, six hundred sixty-one thousand, six hundred forty-two".