65477421 has 12 divisors (see below), whose sum is σ = 100142172. Its totient is φ = 41083776.

The previous prime is 65477417. The next prime is 65477429. The reversal of 65477421 is 12477456.

It can be written as a sum of positive squares in 2 ways, for example, as 18404100 + 47073321 = 4290^2 + 6861^2 .

It is not a de Polignac number, because 65477421 - 2² = 65477417 is a prime.

It is a super-2 number, since 2×65477421² = 8574585321622482, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65477429) 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, 213826 + ... + 214131.

It is an arithmetic number, because the mean of its divisors is an integer number (8345181).

Almost surely, 2^65477421 is an apocalyptic number.

It is an amenable number.

65477421 is a deficient number, since it is larger than the sum of its proper divisors (34664751).

65477421 is a wasteful number, since it uses less digits than its factorization.

65477421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 427980 (or 427977 counting only the distinct ones).

The product of its digits is 47040, while the sum is 36.

The square root of 65477421 is about 8091.8119726054. The cubic root of 65477421 is about 403.0545749700.

The spelling of 65477421 in words is "sixty-five million, four hundred seventy-seven thousand, four hundred twenty-one".