72705532337121 has 4 divisors (see below), whose sum is σ = 96940709782832. Its totient is φ = 48470354891412.

The previous prime is 72705532337107. The next prime is 72705532337153. The reversal of 72705532337121 is 12173323550727.

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 not a de Polignac number, because 72705532337121 - 2⁹ = 72705532336609 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72705532337171) 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, 12117588722851 + ... + 12117588722856.

It is an arithmetic number, because the mean of its divisors is an integer number (24235177445708).

Almost surely, 2^{72705532337121} is an apocalyptic number.

It is an amenable number.

72705532337121 is a deficient number, since it is larger than the sum of its proper divisors (24235177445711).

72705532337121 is a wasteful number, since it uses less digits than its factorization.

72705532337121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24235177445710.

The product of its (nonzero) digits is 1852200, while the sum is 48.

Adding to 72705532337121 its reverse (12173323550727), we get a palindrome (84878855887848).

The spelling of 72705532337121 in words is "seventy-two trillion, seven hundred five billion, five hundred thirty-two million, three hundred thirty-seven thousand, one hundred twenty-one".