265642340540 has 48 divisors (see below), whose sum is σ = 582807923712. Its totient is φ = 101514025536.

The previous prime is 265642340539. The next prime is 265642340543. The reversal of 265642340540 is 45043246562.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (265642340543) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 31277 + ... + 729563.

It is an arithmetic number, because the mean of its divisors is an integer number (12141831744).

Almost surely, 2^265642340540 is an apocalyptic number.

265642340540 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 265642340540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (291403961856).

265642340540 is an abundant number, since it is smaller than the sum of its proper divisors (317165583172).

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

265642340540 is a wasteful number, since it uses less digits than its factorization.

265642340540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 699146 (or 699144 counting only the distinct ones).

The product of its (nonzero) digits is 691200, while the sum is 41.

The spelling of 265642340540 in words is "two hundred sixty-five billion, six hundred forty-two million, three hundred forty thousand, five hundred forty".