1656134647 has 2 divisors, whose sum is σ = 1656134648. Its totient is φ = 1656134646.

The previous prime is 1656134633. The next prime is 1656134659. The reversal of 1656134647 is 7464316561.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1656134647 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1656134047) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 828067323 + 828067324.

It is an arithmetic number, because the mean of its divisors is an integer number (828067324).

Almost surely, 2^1656134647 is an apocalyptic number.

1656134647 is a deficient number, since it is larger than the sum of its proper divisors (1).

1656134647 is an equidigital number, since it uses as much as digits as its factorization.

1656134647 is an evil number, because the sum of its binary digits is even.

The product of its digits is 362880, while the sum is 43.

The square root of 1656134647 is about 40695.6342498799. The cubic root of 1656134647 is about 1183.1284043636.

The spelling of 1656134647 in words is "one billion, six hundred fifty-six million, one hundred thirty-four thousand, six hundred forty-seven".