6165511555420 has 384 divisors, whose sum is σ = 16084857600000. Its totient is φ = 1938082775040.

The previous prime is 6165511555393. The next prime is 6165511555447. The reversal of 6165511555420 is 245551155616.

It is an interprime number because it is at equal distance from previous prime (6165511555393) and next prime (6165511555447).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 12355734331 + ... + 12355734829.

It is an arithmetic number, because the mean of its divisors is an integer number (41887650000).

Almost surely, 2^{6165511555420} 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 6165511555420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (8042428800000).

6165511555420 is an abundant number, since it is smaller than the sum of its proper divisors (9919346044580).

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

6165511555420 is a wasteful number, since it uses less digits than its factorization.

6165511555420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1261 (or 1259 counting only the distinct ones).

The product of its (nonzero) digits is 900000, while the sum is 46.

The spelling of 6165511555420 in words is "six trillion, one hundred sixty-five billion, five hundred eleven million, five hundred fifty-five thousand, four hundred twenty".