1656344749 has 2 divisors, whose sum is σ = 1656344750. Its totient is φ = 1656344748.

The previous prime is 1656344737. The next prime is 1656344777. The reversal of 1656344749 is 9474436561.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1559460100 + 96884649 = 39490^2 + 9843^2 .

It is a cyclic number.

It is not a de Polignac number, because 1656344749 - 2⁵ = 1656344717 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1656344449) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 828172374 + 828172375.

It is an arithmetic number, because the mean of its divisors is an integer number (828172375).

Almost surely, 2^1656344749 is an apocalyptic number.

It is an amenable number.

1656344749 is a deficient number, since it is larger than the sum of its proper divisors (1).

1656344749 is an equidigital number, since it uses as much as digits as its factorization.

1656344749 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2177280, while the sum is 49.

The square root of 1656344749 is about 40698.2155505619. The cubic root of 1656344749 is about 1183.1784339376.

The spelling of 1656344749 in words is "one billion, six hundred fifty-six million, three hundred forty-four thousand, seven hundred forty-nine".