671155820325 has 60 divisors (see below), whose sum is σ = 1243798096068. Its totient is φ = 357781190400.

The previous prime is 671155820249. The next prime is 671155820347. The reversal of 671155820325 is 523028551176.

671155820325 is a `hidden beast` number, since 6 + 71 + 1 + 558 + 2 + 0 + 3 + 25 = 666.

It can be written as a sum of positive squares in 6 ways, for example, as 151627687236 + 519528133089 = 389394^2 + 720783^2 .

It is not a de Polignac number, because 671155820325 - 2⁷ = 671155820197 is a prime.

It is a super-2 number, since 2×671155820325² (a number of 24 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 59 ways as a sum of consecutive naturals, for example, 4282855 + ... + 4436795.

Almost surely, 2^671155820325 is an apocalyptic number.

It is an amenable number.

671155820325 is a deficient number, since it is larger than the sum of its proper divisors (572642275743).

671155820325 is a wasteful number, since it uses less digits than its factorization.

671155820325 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 156116 (or 156102 counting only the distinct ones).

The product of its (nonzero) digits is 504000, while the sum is 45.

The spelling of 671155820325 in words is "six hundred seventy-one billion, one hundred fifty-five million, eight hundred twenty thousand, three hundred twenty-five".