72505178737 has 4 divisors (see below), whose sum is σ = 72602763840. Its totient is φ = 72407593636.

The previous prime is 72505178717. The next prime is 72505178761. The reversal of 72505178737 is 73787150527.

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, and also an emirpimes, since its reverse is a distinct semiprime: 73787150527 = 73421 ⋅1004987.

It is a cyclic number.

It is not a de Polignac number, because 72505178737 - 2¹⁹ = 72504654449 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72505178717) 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, 48791437 + ... + 48792922.

It is an arithmetic number, because the mean of its divisors is an integer number (18150690960).

Almost surely, 2^72505178737 is an apocalyptic number.

It is an amenable number.

72505178737 is a deficient number, since it is larger than the sum of its proper divisors (97585103).

72505178737 is an equidigital number, since it uses as much as digits as its factorization.

72505178737 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 97585102.

The product of its (nonzero) digits is 2881200, while the sum is 52.

The spelling of 72505178737 in words is "seventy-two billion, five hundred five million, one hundred seventy-eight thousand, seven hundred thirty-seven".