671178623 has 2 divisors, whose sum is σ = 671178624. Its totient is φ = 671178622.

The previous prime is 671178593. The next prime is 671178661. The reversal of 671178623 is 326871176.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 671178623 - 2¹⁰ = 671177599 is a prime.

It is a super-2 number, since 2×671178623² = 900961487944352258, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (671178023) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 335589311 + 335589312.

It is an arithmetic number, because the mean of its divisors is an integer number (335589312).

Almost surely, 2^671178623 is an apocalyptic number.

671178623 is a deficient number, since it is larger than the sum of its proper divisors (1).

671178623 is an equidigital number, since it uses as much as digits as its factorization.

671178623 is an evil number, because the sum of its binary digits is even.

The product of its digits is 84672, while the sum is 41.

The square root of 671178623 is about 25907.1152967674. The cubic root of 671178623 is about 875.5468138003.

The spelling of 671178623 in words is "six hundred seventy-one million, one hundred seventy-eight thousand, six hundred twenty-three".