61665960237 has 16 divisors (see below), whose sum is σ = 93977185920. Its totient is φ = 35233938432.

The previous prime is 61665960233. The next prime is 61665960287. The reversal of 61665960237 is 73206956616.

It is a happy number.

It is not a de Polignac number, because 61665960237 - 2² = 61665960233 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 61665960237.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61665960233) 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, 51933 + ... + 355005.

It is an arithmetic number, because the mean of its divisors is an integer number (5873574120).

Almost surely, 2^61665960237 is an apocalyptic number.

It is an amenable number.

61665960237 is a deficient number, since it is larger than the sum of its proper divisors (32311225683).

61665960237 is a wasteful number, since it uses less digits than its factorization.

61665960237 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 312772.

The product of its (nonzero) digits is 2449440, while the sum is 51.

The spelling of 61665960237 in words is "sixty-one billion, six hundred sixty-five million, nine hundred sixty thousand, two hundred thirty-seven".