1656358442 has 4 divisors (see below), whose sum is σ = 2484537666. Its totient is φ = 828179220.

The previous prime is 1656358387. The next prime is 1656358447. The reversal of 1656358442 is 2448536561.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 2448536561 = 5573 ⋅439357.

It can be written as a sum of positive squares in only one way, i.e., 1650878161 + 5480281 = 40631^2 + 2341^2 .

It is a junction number, because it is equal to n+sod(n) for n = 1656358393 and 1656358402.

It is not an unprimeable number, because it can be changed into a prime (1656358447) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 414089609 + ... + 414089612.

Almost surely, 2^1656358442 is an apocalyptic number.

1656358442 is a deficient number, since it is larger than the sum of its proper divisors (828179224).

1656358442 is an equidigital number, since it uses as much as digits as its factorization.

1656358442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 828179223.

The product of its digits is 691200, while the sum is 44.

The square root of 1656358442 is about 40698.3837762632. The cubic root of 1656358442 is about 1183.1816943735.

The spelling of 1656358442 in words is "one billion, six hundred fifty-six million, three hundred fifty-eight thousand, four hundred forty-two".