61661301 has 16 divisors (see below), whose sum is σ = 89994240. Its totient is φ = 37321920.

The previous prime is 61661293. The next prime is 61661309. The reversal of 61661301 is 10316616.

It is an interprime number because it is at equal distance from previous prime (61661293) and next prime (61661309).

It is not a de Polignac number, because 61661301 - 2³ = 61661293 is a prime.

It is a super-3 number, since 3×61661301³ (a number of 24 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61661309) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10581 + ... + 15338.

It is an arithmetic number, because the mean of its divisors is an integer number (5624640).

Almost surely, 2^61661301 is an apocalyptic number.

61661301 is a gapful number since it is divisible by the number (61) formed by its first and last digit.

It is an amenable number.

61661301 is a deficient number, since it is larger than the sum of its proper divisors (28332939).

61661301 is a wasteful number, since it uses less digits than its factorization.

61661301 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25996.

The product of its (nonzero) digits is 648, while the sum is 24.

The square root of 61661301 is about 7852.4710123629. The cubic root of 61661301 is about 395.0671274048.

Adding to 61661301 its reverse (10316616), we get a palindrome (71977917).

The spelling of 61661301 in words is "sixty-one million, six hundred sixty-one thousand, three hundred one".