61660481 has 2 divisors, whose sum is σ = 61660482. Its totient is φ = 61660480.

The previous prime is 61660471. The next prime is 61660507. The reversal of 61660481 is 18406616.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 57896881 + 3763600 = 7609^2 + 1940^2 .

It is a cyclic number.

It is not a de Polignac number, because 61660481 - 2¹⁰ = 61659457 is a prime.

It is a super-2 number, since 2×61660481² = 7604029834302722, which contains 22 as substring.

It is a Chen prime.

It is equal to p_3654671 and since 61660481 and 3654671 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (61660441) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30830240 + 30830241.

It is an arithmetic number, because the mean of its divisors is an integer number (30830241).

Almost surely, 2^61660481 is an apocalyptic number.

It is an amenable number.

61660481 is a deficient number, since it is larger than the sum of its proper divisors (1).

61660481 is an equidigital number, since it uses as much as digits as its factorization.

61660481 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6912, while the sum is 32.

The square root of 61660481 is about 7852.4187993255. The cubic root of 61660481 is about 395.0653761363.

The spelling of 61660481 in words is "sixty-one million, six hundred sixty thousand, four hundred eighty-one".