656771345 has 4 divisors (see below), whose sum is σ = 788125620. Its totient is φ = 525417072.

The previous prime is 656771327. The next prime is 656771359. The reversal of 656771345 is 543177656.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 144744961 + 512026384 = 12031^2 + 22628^2 .

It is a cyclic number.

It is not a de Polignac number, because 656771345 - 2¹⁴ = 656754961 is a prime.

It is a super-2 number, since 2×656771345² = 862697199226218050, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 656771296 and 656771305.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 65677130 + ... + 65677139.

It is an arithmetic number, because the mean of its divisors is an integer number (197031405).

Almost surely, 2^656771345 is an apocalyptic number.

It is an amenable number.

656771345 is a deficient number, since it is larger than the sum of its proper divisors (131354275).

656771345 is a wasteful number, since it uses less digits than its factorization.

656771345 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 131354274.

The product of its digits is 529200, while the sum is 44.

The square root of 656771345 is about 25627.5505072178. The cubic root of 656771345 is about 869.2367221018.

The spelling of 656771345 in words is "six hundred fifty-six million, seven hundred seventy-one thousand, three hundred forty-five".