65721526 has 16 divisors (see below), whose sum is σ = 106311744. Its totient is φ = 30291264.

The previous prime is 65721499. The next prime is 65721533. The reversal of 65721526 is 62512756.

It is a junction number, because it is equal to n+sod(n) for n = 65721491 and 65721500.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 25635 + ... + 28081.

It is an arithmetic number, because the mean of its divisors is an integer number (6644484).

Almost surely, 2^65721526 is an apocalyptic number.

65721526 is a deficient number, since it is larger than the sum of its proper divisors (40590218).

65721526 is a wasteful number, since it uses less digits than its factorization.

65721526 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3495.

The product of its digits is 25200, while the sum is 34.

The square root of 65721526 is about 8106.8813979236. The cubic root of 65721526 is about 403.5548269271.

The spelling of 65721526 in words is "sixty-five million, seven hundred twenty-one thousand, five hundred twenty-six".