65120599540 has 12 divisors (see below), whose sum is σ = 136753259076. Its totient is φ = 26048239808.

The previous prime is 65120599519. The next prime is 65120599597. The reversal of 65120599540 is 4599502156.

It can be written as a sum of positive squares in 2 ways, for example, as 31460826384 + 33659773156 = 177372^2 + 183466^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1628014969 + ... + 1628015008.

It is an arithmetic number, because the mean of its divisors is an integer number (11396104923).

Almost surely, 2^65120599540 is an apocalyptic number.

It is an amenable number.

65120599540 is an abundant number, since it is smaller than the sum of its proper divisors (71632659536).

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

65120599540 is a wasteful number, since it uses less digits than its factorization.

65120599540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3256029986 (or 3256029984 counting only the distinct ones).

The product of its (nonzero) digits is 486000, while the sum is 46.

The spelling of 65120599540 in words is "sixty-five billion, one hundred twenty million, five hundred ninety-nine thousand, five hundred forty".