73721543124461 has 4 divisors (see below), whose sum is σ = 73721562314592. Its totient is φ = 73721523934332.

The previous prime is 73721543124407. The next prime is 73721543124547. The reversal of 73721543124461 is 16442134512737.

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 73721543124461 - 2¹⁴ = 73721543108077 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 (73721540124461) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1626905 + ... + 12251118.

It is an arithmetic number, because the mean of its divisors is an integer number (18430390578648).

Almost surely, 2^{73721543124461} is an apocalyptic number.

It is an amenable number.

73721543124461 is a deficient number, since it is larger than the sum of its proper divisors (19190131).

73721543124461 is a wasteful number, since it uses less digits than its factorization.

73721543124461 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19190130.

The product of its digits is 3386880, while the sum is 50.

The spelling of 73721543124461 in words is "seventy-three trillion, seven hundred twenty-one billion, five hundred forty-three million, one hundred twenty-four thousand, four hundred sixty-one".