61871871900 has 72 divisors (see below), whose sum is σ = 179124785280. Its totient is φ = 16489135040.

The previous prime is 61871871889. The next prime is 61871871913. The reversal of 61871871900 is 917817816.

It is a super-2 number, since 2×61871871900² (a number of 22 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 61871871900.

It is a congruent number.

It is an unprimeable number.

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 23 ways as a sum of consecutive naturals, for example, 438241 + ... + 561959.

It is an arithmetic number, because the mean of its divisors is an integer number (2487844240).

Almost surely, 2^61871871900 is an apocalyptic number.

61871871900 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

61871871900 is an abundant number, since it is smaller than the sum of its proper divisors (117252913380).

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

61871871900 is a wasteful number, since it uses less digits than its factorization.

61871871900 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 125403 (or 125396 counting only the distinct ones).

The product of its (nonzero) digits is 169344, while the sum is 48.

The spelling of 61871871900 in words is "sixty-one billion, eight hundred seventy-one million, eight hundred seventy-one thousand, nine hundred".