65157561 has 16 divisors (see below), whose sum is σ = 110320000. Its totient is φ = 37232784.

The previous prime is 65157559. The next prime is 65157571. The reversal of 65157561 is 16575156.

It is not a de Polignac number, because 65157561 - 2¹ = 65157559 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (65157571) 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, 172186 + ... + 172563.

It is an arithmetic number, because the mean of its divisors is an integer number (6895000).

Almost surely, 2^65157561 is an apocalyptic number.

It is an amenable number.

65157561 is a deficient number, since it is larger than the sum of its proper divisors (45162439).

65157561 is a wasteful number, since it uses less digits than its factorization.

65157561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 344765 (or 344759 counting only the distinct ones).

The product of its digits is 31500, while the sum is 36.

The square root of 65157561 is about 8072.0233522953. The cubic root of 65157561 is about 402.3971904130.

The spelling of 65157561 in words is "sixty-five million, one hundred fifty-seven thousand, five hundred sixty-one".