1656630145 has 4 divisors (see below), whose sum is σ = 1987956180. Its totient is φ = 1325304112.

The previous prime is 1656630109. The next prime is 1656630163. The reversal of 1656630145 is 5410366561.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5410366561 = 907 ⋅5965123.

It can be written as a sum of positive squares in 2 ways, for example, as 1316891521 + 339738624 = 36289^2 + 18432^2 .

It is a cyclic number.

It is not a de Polignac number, because 1656630145 - 2²⁹ = 1119759233 is a prime.

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, 165663010 + ... + 165663019.

It is an arithmetic number, because the mean of its divisors is an integer number (496989045).

Almost surely, 2^1656630145 is an apocalyptic number.

It is an amenable number.

1656630145 is a deficient number, since it is larger than the sum of its proper divisors (331326035).

1656630145 is an equidigital number, since it uses as much as digits as its factorization.

1656630145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 331326034.

The product of its (nonzero) digits is 64800, while the sum is 37.

The square root of 1656630145 is about 40701.7216466331. The cubic root of 1656630145 is about 1183.2463857736.

The spelling of 1656630145 in words is "one billion, six hundred fifty-six million, six hundred thirty thousand, one hundred forty-five".