61661724087 has 16 divisors (see below), whose sum is σ = 83266813440. Its totient is φ = 40582356672.

The previous prime is 61661724083. The next prime is 61661724151. The reversal of 61661724087 is 78042716616.

It is not a de Polignac number, because 61661724087 - 2² = 61661724083 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61661724083) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3208168 + ... + 3227330.

It is an arithmetic number, because the mean of its divisors is an integer number (5204175840).

Almost surely, 2^61661724087 is an apocalyptic number.

61661724087 is a deficient number, since it is larger than the sum of its proper divisors (21605089353).

61661724087 is a wasteful number, since it uses less digits than its factorization.

61661724087 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32822.

The product of its (nonzero) digits is 677376, while the sum is 48.

The spelling of 61661724087 in words is "sixty-one billion, six hundred sixty-one million, seven hundred twenty-four thousand, eighty-seven".