1656670065 has 8 divisors (see below), whose sum is σ = 2650672128. Its totient is φ = 883557360.

The previous prime is 1656670049. The next prime is 1656670091. The reversal of 1656670065 is 5600766561.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1656670065 - 2⁴ = 1656670049 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1656669999 and 1656670026.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 55222321 + ... + 55222350.

It is an arithmetic number, because the mean of its divisors is an integer number (331334016).

Almost surely, 2^1656670065 is an apocalyptic number.

1656670065 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1656670065 is a deficient number, since it is larger than the sum of its proper divisors (994002063).

1656670065 is a wasteful number, since it uses less digits than its factorization.

1656670065 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 110444679.

The product of its (nonzero) digits is 226800, while the sum is 42.

The square root of 1656670065 is about 40702.2120406250. The cubic root of 1656670065 is about 1183.2558899703.

The spelling of 1656670065 in words is "one billion, six hundred fifty-six million, six hundred seventy thousand, sixty-five".