6215555117720 has 128 divisors (see below), whose sum is σ = 15885223200000. Its totient is φ = 2169827274240.

The previous prime is 6215555117719. The next prime is 6215555117749. The reversal of 6215555117720 is 277115555126.

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 31 ways as a sum of consecutive naturals, for example, 4299755 + ... + 5560485.

It is an arithmetic number, because the mean of its divisors is an integer number (124103306250).

Almost surely, 2^{6215555117720} 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 6215555117720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (7942611600000).

6215555117720 is an abundant number, since it is smaller than the sum of its proper divisors (9669668082280).

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

6215555117720 is a wasteful number, since it uses less digits than its factorization.

6215555117720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1261273 (or 1261269 counting only the distinct ones).

The product of its (nonzero) digits is 735000, while the sum is 47.

The spelling of 6215555117720 in words is "six trillion, two hundred fifteen billion, five hundred fifty-five million, one hundred seventeen thousand, seven hundred twenty".