671749249248 has 540 divisors, whose sum is σ = 2526114862656. Its totient is φ = 174476332800.

The previous prime is 671749249183. The next prime is 671749249289. The reversal of 671749249248 is 842942947176.

671749249248 is a `hidden beast` number, since 6 + 7 + 17 + 4 + 92 + 492 + 48 = 666.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 89 ways as a sum of consecutive naturals, for example, 15346113 + ... + 15389823.

Almost surely, 2^671749249248 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 671749249248, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1263057431328).

671749249248 is an abundant number, since it is smaller than the sum of its proper divisors (1854365613408).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

671749249248 is a wasteful number, since it uses less digits than its factorization.

671749249248 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43769 (or 43734 counting only the distinct ones).

The product of its digits is 48771072, while the sum is 63.

The spelling of 671749249248 in words is "six hundred seventy-one billion, seven hundred forty-nine million, two hundred forty-nine thousand, two hundred forty-eight".