65661080 has 32 divisors (see below), whose sum is σ = 148206240. Its totient is φ = 26181120.

The previous prime is 65661077. The next prime is 65661083. The reversal of 65661080 is 8016656.

It is an interprime number because it is at equal distance from previous prime (65661077) and next prime (65661083).

It is a super-2 number, since 2×65661080² = 8622754853532800, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65661083) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11045 + ... + 15915.

It is an arithmetic number, because the mean of its divisors is an integer number (4631445).

Almost surely, 2^65661080 is an apocalyptic number.

It is an amenable number.

65661080 is an abundant number, since it is smaller than the sum of its proper divisors (82545160).

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

65661080 is a wasteful number, since it uses less digits than its factorization.

65661080 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5219 (or 5215 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 32.

The square root of 65661080 is about 8103.1524729577. The cubic root of 65661080 is about 403.4310686053.

The spelling of 65661080 in words is "sixty-five million, six hundred sixty-one thousand, eighty".