671641641 has 12 divisors (see below), whose sum is σ = 1058344560. Its totient is φ = 407055480.

The previous prime is 671641637. The next prime is 671641643. The reversal of 671641641 is 146146176.

It is a happy number.

671641641 is a `hidden beast` number, since 6 + 7 + 1 + 6 + 4 + 1 + 641 = 666.

It is not a de Polignac number, because 671641641 - 2² = 671641637 is a prime.

It is a super-2 number, since 2×671641641² = 902204987850345762, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 671641596 and 671641605.

It is not an unprimeable number, because it can be changed into a prime (671641643) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3392031 + ... + 3392228.

It is an arithmetic number, because the mean of its divisors is an integer number (88195380).

Almost surely, 2^671641641 is an apocalyptic number.

It is an amenable number.

671641641 is a deficient number, since it is larger than the sum of its proper divisors (386702919).

671641641 is a wasteful number, since it uses less digits than its factorization.

671641641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6784276 (or 6784273 counting only the distinct ones).

The product of its digits is 24192, while the sum is 36.

The square root of 671641641 is about 25916.0498726175. The cubic root of 671641641 is about 875.7481018703.

The spelling of 671641641 in words is "six hundred seventy-one million, six hundred forty-one thousand, six hundred forty-one".