65129550 has 48 divisors (see below), whose sum is σ = 171029232. Its totient is φ = 16345600.

The previous prime is 65129531. The next prime is 65129551. The reversal of 65129550 is 5592156.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65129551) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 10221 + ... + 15320.

It is an arithmetic number, because the mean of its divisors is an integer number (3563109).

Almost surely, 2^65129550 is an apocalyptic number.

65129550 is an abundant number, since it is smaller than the sum of its proper divisors (105899682).

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

65129550 is a wasteful number, since it uses less digits than its factorization.

65129550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25573 (or 25568 counting only the distinct ones).

The product of its (nonzero) digits is 13500, while the sum is 33.

The square root of 65129550 is about 8070.2880989467. The cubic root of 65129550 is about 402.3395191153.

The spelling of 65129550 in words is "sixty-five million, one hundred twenty-nine thousand, five hundred fifty".