671618951 has 8 divisors (see below), whose sum is σ = 674456640. Its totient is φ = 668787552.

The previous prime is 671618947. The next prime is 671618953. The reversal of 671618951 is 159816176.

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

It is a cyclic number.

It is not a de Polignac number, because 671618951 - 2² = 671618947 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (671618953) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 386681 + ... + 388413.

It is an arithmetic number, because the mean of its divisors is an integer number (84307080).

Almost surely, 2^671618951 is an apocalyptic number.

671618951 is a deficient number, since it is larger than the sum of its proper divisors (2837689).

671618951 is a wasteful number, since it uses less digits than its factorization.

671618951 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3145.

The product of its digits is 90720, while the sum is 44.

The square root of 671618951 is about 25915.6121093058. The cubic root of 671618951 is about 875.7382399901.

The spelling of 671618951 in words is "six hundred seventy-one million, six hundred eighteen thousand, nine hundred fifty-one".