1656736045 has 4 divisors (see below), whose sum is σ = 1988083260. Its totient is φ = 1325388832.

The previous prime is 1656736043. The next prime is 1656736049. The reversal of 1656736045 is 5406376561.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1065565449 + 591170596 = 32643^2 + 24314^2 .

It is a cyclic number.

It is not a de Polignac number, because 1656736045 - 2¹ = 1656736043 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1656735992 and 1656736010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1656736043) 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, 165673600 + ... + 165673609.

It is an arithmetic number, because the mean of its divisors is an integer number (497020815).

Almost surely, 2^1656736045 is an apocalyptic number.

It is an amenable number.

1656736045 is a deficient number, since it is larger than the sum of its proper divisors (331347215).

1656736045 is an equidigital number, since it uses as much as digits as its factorization.

1656736045 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 331347214.

The product of its (nonzero) digits is 453600, while the sum is 43.

The square root of 1656736045 is about 40703.0225536139. The cubic root of 1656736045 is about 1183.2715982252.

The spelling of 1656736045 in words is "one billion, six hundred fifty-six million, seven hundred thirty-six thousand, forty-five".