680217161 has 16 divisors (see below), whose sum is σ = 746493888. Its totient is φ = 615988800.

The previous prime is 680217103. The next prime is 680217169. The reversal of 680217161 is 161712086.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 680217161 - 2¹⁰ = 680216137 is a prime.

It is a super-2 number, since 2×680217161² = 925390772237799842, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (680217169) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 388490 + ... + 390236.

It is an arithmetic number, because the mean of its divisors is an integer number (46655868).

Almost surely, 2^680217161 is an apocalyptic number.

680217161 is a gapful number since it is divisible by the number (61) formed by its first and last digit.

It is an amenable number.

680217161 is a deficient number, since it is larger than the sum of its proper divisors (66276727).

680217161 is a wasteful number, since it uses less digits than its factorization.

680217161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2312.

The product of its (nonzero) digits is 4032, while the sum is 32.

The square root of 680217161 is about 26080.9731605245. The cubic root of 680217161 is about 879.4595342654.

The spelling of 680217161 in words is "six hundred eighty million, two hundred seventeen thousand, one hundred sixty-one".