61745603261 has 4 divisors (see below), whose sum is σ = 61908520800. Its totient is φ = 61582685724.

The previous prime is 61745603251. The next prime is 61745603279. The reversal of 61745603261 is 16230654716.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 61745603261 - 2⁶ = 61745603197 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 (61745603201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 81458201 + ... + 81458958.

It is an arithmetic number, because the mean of its divisors is an integer number (15477130200).

Almost surely, 2^61745603261 is an apocalyptic number.

It is an amenable number.

61745603261 is a deficient number, since it is larger than the sum of its proper divisors (162917539).

61745603261 is a wasteful number, since it uses less digits than its factorization.

61745603261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 162917538.

The product of its (nonzero) digits is 181440, while the sum is 41.

The spelling of 61745603261 in words is "sixty-one billion, seven hundred forty-five million, six hundred three thousand, two hundred sixty-one".