1956645623 has 2 divisors, whose sum is σ = 1956645624. Its totient is φ = 1956645622.

The previous prime is 1956645589. The next prime is 1956645661. The reversal of 1956645623 is 3265466591.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1956645623 - 2¹⁸ = 1956383479 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1956645323) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 978322811 + 978322812.

It is an arithmetic number, because the mean of its divisors is an integer number (978322812).

Almost surely, 2^1956645623 is an apocalyptic number.

1956645623 is a deficient number, since it is larger than the sum of its proper divisors (1).

1956645623 is an equidigital number, since it uses as much as digits as its factorization.

1956645623 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1166400, while the sum is 47.

The square root of 1956645623 is about 44233.9871931075. The cubic root of 1956645623 is about 1250.7506154110.

The spelling of 1956645623 in words is "one billion, nine hundred fifty-six million, six hundred forty-five thousand, six hundred twenty-three".