65557961 has 12 divisors (see below), whose sum is σ = 79077312. Its totient is φ = 53232984.

The previous prime is 65557957. The next prime is 65557993. The reversal of 65557961 is 16975556.

It is not a de Polignac number, because 65557961 - 2² = 65557957 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (65557931) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 10445 + ... + 15498.

It is an arithmetic number, because the mean of its divisors is an integer number (6589776).

Almost surely, 2^65557961 is an apocalyptic number.

It is an amenable number.

65557961 is a deficient number, since it is larger than the sum of its proper divisors (13519351).

65557961 is a wasteful number, since it uses less digits than its factorization.

65557961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25988 (or 25969 counting only the distinct ones).

The product of its digits is 283500, while the sum is 44.

The square root of 65557961 is about 8096.7870788357. The cubic root of 65557961 is about 403.2197653220.

The spelling of 65557961 in words is "sixty-five million, five hundred fifty-seven thousand, nine hundred sixty-one".