1656145573 has 2 divisors, whose sum is σ = 1656145574. Its totient is φ = 1656145572.

The previous prime is 1656145511. The next prime is 1656145609. The reversal of 1656145573 is 3755416561.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1447574209 + 208571364 = 38047^2 + 14442^2 .

It is a cyclic number.

It is not a de Polignac number, because 1656145573 - 2¹⁷ = 1656014501 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1656145873) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 828072786 + 828072787.

It is an arithmetic number, because the mean of its divisors is an integer number (828072787).

Almost surely, 2^1656145573 is an apocalyptic number.

It is an amenable number.

1656145573 is a deficient number, since it is larger than the sum of its proper divisors (1).

1656145573 is an equidigital number, since it uses as much as digits as its factorization.

1656145573 is an evil number, because the sum of its binary digits is even.

The product of its digits is 378000, while the sum is 43.

The square root of 1656145573 is about 40695.7684901023. The cubic root of 1656145573 is about 1183.1310061714.

The spelling of 1656145573 in words is "one billion, six hundred fifty-six million, one hundred forty-five thousand, five hundred seventy-three".