690556161 has 8 divisors (see below), whose sum is σ = 923211520. Its totient is φ = 459135792.

The previous prime is 690556127. The next prime is 690556177. The reversal of 690556161 is 161655096.

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

It is not a de Polignac number, because 690556161 - 2¹⁰ = 690555137 is a prime.

It is a super-2 number, since 2×690556161² = 953735622990115842, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (690556561) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 307441 + ... + 309678.

It is an arithmetic number, because the mean of its divisors is an integer number (115401440).

Almost surely, 2^690556161 is an apocalyptic number.

It is an amenable number.

690556161 is a deficient number, since it is larger than the sum of its proper divisors (232655359).

690556161 is a wasteful number, since it uses less digits than its factorization.

690556161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 617495.

The product of its (nonzero) digits is 48600, while the sum is 39.

The square root of 690556161 is about 26278.4352844685. The cubic root of 690556161 is about 883.8929462473.

The spelling of 690556161 in words is "six hundred ninety million, five hundred fifty-six thousand, one hundred sixty-one".