61506620126165 has 16 divisors (see below), whose sum is σ = 76794392790000. Its totient is φ = 47233945769472.

The previous prime is 61506620126113. The next prime is 61506620126291. The reversal of 61506620126165 is 56162102660516.

It can be written as a sum of positive squares in 8 ways, for example, as 2217266924401 + 59289353201764 = 1489049^2 + 7699958^2 .

It is a cyclic number.

It is not a de Polignac number, because 61506620126165 - 2⁶ = 61506620126101 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1225939040 + ... + 1225989209.

It is an arithmetic number, because the mean of its divisors is an integer number (4799649549375).

Almost surely, 2^{61506620126165} is an apocalyptic number.

It is an amenable number.

61506620126165 is a deficient number, since it is larger than the sum of its proper divisors (15287772663835).

61506620126165 is a wasteful number, since it uses less digits than its factorization.

61506620126165 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2451928456.

The product of its (nonzero) digits is 777600, while the sum is 47.

The spelling of 61506620126165 in words is "sixty-one trillion, five hundred six billion, six hundred twenty million, one hundred twenty-six thousand, one hundred sixty-five".