61721476037 has 16 divisors (see below), whose sum is σ = 72281390832. Its totient is φ = 52173020160.

The previous prime is 61721476031. The next prime is 61721476039. The reversal of 61721476037 is 73067412716.

It can be written as a sum of positive squares in 8 ways, for example, as 8366943841 + 53354532196 = 91471^2 + 230986^2 .

It is a cyclic number.

It is not a de Polignac number, because 61721476037 - 2⁴ = 61721476021 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61721476031) 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, 3765914 + ... + 3782267.

It is an arithmetic number, because the mean of its divisors is an integer number (4517586927).

Almost surely, 2^61721476037 is an apocalyptic number.

It is an amenable number.

61721476037 is a deficient number, since it is larger than the sum of its proper divisors (10559914795).

61721476037 is a wasteful number, since it uses less digits than its factorization.

61721476037 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7548248.

The product of its (nonzero) digits is 296352, while the sum is 44.

The spelling of 61721476037 in words is "sixty-one billion, seven hundred twenty-one million, four hundred seventy-six thousand, thirty-seven".