671751642557157 has 8 divisors (see below), whose sum is σ = 934610980949184. Its totient is φ = 428363366268288.

The previous prime is 671751642557059. The next prime is 671751642557189. The reversal of 671751642557157 is 751755246157176.

It is a happy number.

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

It is not a de Polignac number, because 671751642557157 - 2⁷ = 671751642557029 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (69), and also a Moran number because the ratio is a prime number: 9735531051553 = 671751642557157 / (6 + 7 + 1 + 7 + 5 + 1 + 6 + 4 + 2 + 5 + 5 + 7 + 1 + 5 + 7).

It is a junction number, because it is equal to n+sod(n) for n = 671751642557091 and 671751642557100.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (671751642557197) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4867765525708 + ... + 4867765525845.

It is an arithmetic number, because the mean of its divisors is an integer number (116826372618648).

Almost surely, 2^{671751642557157} is an apocalyptic number.

It is an amenable number.

671751642557157 is a deficient number, since it is larger than the sum of its proper divisors (262859338392027).

671751642557157 is a wasteful number, since it uses less digits than its factorization.

671751642557157 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9735531051579.

The product of its digits is 432180000, while the sum is 69.

The spelling of 671751642557157 in words is "six hundred seventy-one trillion, seven hundred fifty-one billion, six hundred forty-two million, five hundred fifty-seven thousand, one hundred fifty-seven".