61165601573 has 2 divisors, whose sum is σ = 61165601574. Its totient is φ = 61165601572.

The previous prime is 61165601543. The next prime is 61165601669. The reversal of 61165601573 is 37510656116.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 34359071044 + 26806530529 = 185362^2 + 163727^2 .

It is a cyclic number.

It is not a de Polignac number, because 61165601573 - 2¹⁰ = 61165600549 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 61165601573.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61165601533) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30582800786 + 30582800787.

It is an arithmetic number, because the mean of its divisors is an integer number (30582800787).

Almost surely, 2^61165601573 is an apocalyptic number.

It is an amenable number.

61165601573 is a deficient number, since it is larger than the sum of its proper divisors (1).

61165601573 is an equidigital number, since it uses as much as digits as its factorization.

61165601573 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 113400, while the sum is 41.

The spelling of 61165601573 in words is "sixty-one billion, one hundred sixty-five million, six hundred one thousand, five hundred seventy-three".