671267755381 has 8 divisors (see below), whose sum is σ = 671873582520. Its totient is φ = 670662140352.

The previous prime is 671267755343. The next prime is 671267755387. The reversal of 671267755381 is 183557762176.

671267755381 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 563377842225 + 107889913156 = 750585^2 + 328466^2 .

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 671267755381 - 2²¹ = 671265658229 is a prime.

It is a super-2 number, since 2×671267755381² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (671267755387) 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, 6658015 + ... + 6758083.

It is an arithmetic number, because the mean of its divisors is an integer number (83984197815).

Almost surely, 2^671267755381 is an apocalyptic number.

It is an amenable number.

671267755381 is a deficient number, since it is larger than the sum of its proper divisors (605827139).

671267755381 is a wasteful number, since it uses less digits than its factorization.

671267755381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 106055.

The product of its digits is 14817600, while the sum is 58.

The spelling of 671267755381 in words is "six hundred seventy-one billion, two hundred sixty-seven million, seven hundred fifty-five thousand, three hundred eighty-one".