265643463645420 has 192 divisors, whose sum is σ = 858586403598336. Its totient is φ = 60109567027200.

The previous prime is 265643463645383. The next prime is 265643463645467. The reversal of 265643463645420 is 24546364346562.

265643463645420 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (60).

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 331196589 + ... + 331997691.

It is an arithmetic number, because the mean of its divisors is an integer number (4471804185408).

Almost surely, 2^{265643463645420} is an apocalyptic number.

265643463645420 is a gapful number since it is divisible by the number (20) 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 265643463645420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (429293201799168).

265643463645420 is an abundant number, since it is smaller than the sum of its proper divisors (592942939952916).

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

265643463645420 is a wasteful number, since it uses less digits than its factorization.

265643463645420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 809040 (or 809038 counting only the distinct ones).

The product of its (nonzero) digits is 298598400, while the sum is 60.

The spelling of 265643463645420 in words is "two hundred sixty-five trillion, six hundred forty-three billion, four hundred sixty-three million, six hundred forty-five thousand, four hundred twenty".