671261660523 has 6 divisors (see below), whose sum is σ = 969600176324. Its totient is φ = 447507773676.

The previous prime is 671261660507. The next prime is 671261660551. The reversal of 671261660523 is 325066162176.

671261660523 is a `hidden beast` number, since 6 + 7 + 1 + 2 + 6 + 16 + 605 + 23 = 666.

It is not a de Polignac number, because 671261660523 - 2⁴ = 671261660507 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (671261660623) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 37292314465 + ... + 37292314482.

Almost surely, 2^671261660523 is an apocalyptic number.

671261660523 is a deficient number, since it is larger than the sum of its proper divisors (298338515801).

671261660523 is a wasteful number, since it uses less digits than its factorization.

671261660523 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 74584628953 (or 74584628950 counting only the distinct ones).

The product of its (nonzero) digits is 544320, while the sum is 45.

The spelling of 671261660523 in words is "six hundred seventy-one billion, two hundred sixty-one million, six hundred sixty thousand, five hundred twenty-three".