1656161051 has 4 divisors (see below), whose sum is σ = 1656244392. Its totient is φ = 1656077712.

The previous prime is 1656161047. The next prime is 1656161057. The reversal of 1656161051 is 1501616561.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 1501616561 = 313 ⋅4797497.

It is a cyclic number.

It is not a de Polignac number, because 1656161051 - 2² = 1656161047 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1656160999 and 1656161017.

It is not an unprimeable number, because it can be changed into a prime (1656161057) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7400 + ... + 58026.

It is an arithmetic number, because the mean of its divisors is an integer number (414061098).

Almost surely, 2^1656161051 is an apocalyptic number.

1656161051 is a deficient number, since it is larger than the sum of its proper divisors (83341).

1656161051 is an equidigital number, since it uses as much as digits as its factorization.

1656161051 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 83340.

The product of its (nonzero) digits is 5400, while the sum is 32.

The square root of 1656161051 is about 40695.9586568495. The cubic root of 1656161051 is about 1183.1346919273.

The spelling of 1656161051 in words is "one billion, six hundred fifty-six million, one hundred sixty-one thousand, fifty-one".