1656430457 has 4 divisors (see below), whose sum is σ = 1807015056. Its totient is φ = 1505845860.

The previous prime is 1656430453. The next prime is 1656430483. The reversal of 1656430457 is 7540346561.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1656430457 - 2² = 1656430453 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1656430453) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 75292283 + ... + 75292304.

It is an arithmetic number, because the mean of its divisors is an integer number (451753764).

Almost surely, 2^1656430457 is an apocalyptic number.

It is an amenable number.

1656430457 is a deficient number, since it is larger than the sum of its proper divisors (150584599).

1656430457 is a wasteful number, since it uses less digits than its factorization.

1656430457 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 150584598.

The product of its (nonzero) digits is 302400, while the sum is 41.

The square root of 1656430457 is about 40699.2685069400. The cubic root of 1656430457 is about 1183.1988415467.

The spelling of 1656430457 in words is "one billion, six hundred fifty-six million, four hundred thirty thousand, four hundred fifty-seven".