61061661 has 16 divisors (see below), whose sum is σ = 93381120. Its totient is φ = 39394080.

The previous prime is 61061659. The next prime is 61061683. The reversal of 61061661 is 16616016.

It is not a de Polignac number, because 61061661 - 2¹ = 61061659 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61061621) 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, 35640 + ... + 37313.

It is an arithmetic number, because the mean of its divisors is an integer number (5836320).

Almost surely, 2^61061661 is an apocalyptic number.

It is an amenable number.

61061661 is a deficient number, since it is larger than the sum of its proper divisors (32319459).

61061661 is a wasteful number, since it uses less digits than its factorization.

61061661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72993 (or 72987 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 27.

The square root of 61061661 is about 7814.1961198833. The cubic root of 61061661 is about 393.7823120875.

Adding to 61061661 its reverse (16616016), we get a palindrome (77677677).

The spelling of 61061661 in words is "sixty-one million, sixty-one thousand, six hundred sixty-one".