61661473 has 2 divisors, whose sum is σ = 61661474. Its totient is φ = 61661472.

The previous prime is 61661461. The next prime is 61661491. The reversal of 61661473 is 37416616.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 61653904 + 7569 = 7852^2 + 87^2 .

It is a cyclic number.

It is not a de Polignac number, because 61661473 - 2¹³ = 61653281 is a prime.

It is a super-3 number, since 3×61661473³ (a number of 24 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (61661773) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30830736 + 30830737.

It is an arithmetic number, because the mean of its divisors is an integer number (30830737).

Almost surely, 2^61661473 is an apocalyptic number.

It is an amenable number.

61661473 is a deficient number, since it is larger than the sum of its proper divisors (1).

61661473 is an equidigital number, since it uses as much as digits as its factorization.

61661473 is an evil number, because the sum of its binary digits is even.

The product of its digits is 18144, while the sum is 34.

The square root of 61661473 is about 7852.4819643219. The cubic root of 61661473 is about 395.0674947420.

The spelling of 61661473 in words is "sixty-one million, six hundred sixty-one thousand, four hundred seventy-three".