1671612500 has 72 divisors (see below), whose sum is σ = 3682311192. Its totient is φ = 663920000.

The previous prime is 1671612493. The next prime is 1671612539. The reversal of 1671612500 is 52161761.

It can be written as a sum of positive squares in 12 ways, for example, as 1671337924 + 274576 = 40882^2 + 524^2 .

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2162114 + ... + 2162886.

It is an arithmetic number, because the mean of its divisors is an integer number (51143211).

Almost surely, 2^1671612500 is an apocalyptic number.

1671612500 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1671612500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1841155596).

1671612500 is an abundant number, since it is smaller than the sum of its proper divisors (2010698692).

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

1671612500 is an equidigital number, since it uses as much as digits as its factorization.

1671612500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 975 (or 953 counting only the distinct ones).

The product of its (nonzero) digits is 2520, while the sum is 29.

The square root of 1671612500 is about 40885.3580148199. The cubic root of 1671612500 is about 1186.8027300884.

The spelling of 1671612500 in words is "one billion, six hundred seventy-one million, six hundred twelve thousand, five hundred".