61931449681665 has 8 divisors (see below), whose sum is σ = 99090319490688. Its totient is φ = 33030106496880.

The previous prime is 61931449681663. The next prime is 61931449681667. The reversal of 61931449681665 is 56618694413916.

It is an interprime number because it is at equal distance from previous prime (61931449681663) and next prime (61931449681667).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 61931449681665 - 2¹ = 61931449681663 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 61931449681665.

It is not an unprimeable number, because it can be changed into a prime (61931449681663) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2064381656041 + ... + 2064381656070.

It is an arithmetic number, because the mean of its divisors is an integer number (12386289936336).

Almost surely, 2^{61931449681665} is an apocalyptic number.

It is an amenable number.

61931449681665 is a deficient number, since it is larger than the sum of its proper divisors (37158869809023).

61931449681665 is a wasteful number, since it uses less digits than its factorization.

61931449681665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4128763312119.

The product of its digits is 201553920, while the sum is 69.

The spelling of 61931449681665 in words is "sixty-one trillion, nine hundred thirty-one billion, four hundred forty-nine million, six hundred eighty-one thousand, six hundred sixty-five".