73240215553 has 4 divisors (see below), whose sum is σ = 77094963760. Its totient is φ = 69385467348.

The previous prime is 73240215539. The next prime is 73240215563. The reversal of 73240215553 is 35551204237.

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 73240215553 - 2¹⁷ = 73240084481 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (73240215533) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1927374075 + ... + 1927374112.

It is an arithmetic number, because the mean of its divisors is an integer number (19273740940).

Almost surely, 2^73240215553 is an apocalyptic number.

It is an amenable number.

73240215553 is a deficient number, since it is larger than the sum of its proper divisors (3854748207).

73240215553 is a wasteful number, since it uses less digits than its factorization.

73240215553 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3854748206.

The product of its (nonzero) digits is 126000, while the sum is 37.

The spelling of 73240215553 in words is "seventy-three billion, two hundred forty million, two hundred fifteen thousand, five hundred fifty-three".