73135751065561 has 4 divisors (see below), whose sum is σ = 73138841811072. Its totient is φ = 73132660320052.

The previous prime is 73135751065511. The next prime is 73135751065589. The reversal of 73135751065561 is 16556015753137.

It is a happy number.

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 73135751065561 - 2¹⁷ = 73135750934489 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (73135751065511) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1545337261 + ... + 1545384586.

It is an arithmetic number, because the mean of its divisors is an integer number (18284710452768).

Almost surely, 2^{73135751065561} is an apocalyptic number.

It is an amenable number.

73135751065561 is a deficient number, since it is larger than the sum of its proper divisors (3090745511).

73135751065561 is a wasteful number, since it uses less digits than its factorization.

73135751065561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3090745510.

The product of its (nonzero) digits is 9922500, while the sum is 55.

The spelling of 73135751065561 in words is "seventy-three trillion, one hundred thirty-five billion, seven hundred fifty-one million, sixty-five thousand, five hundred sixty-one".