72505732157 has 4 divisors (see below), whose sum is σ = 72509188416. Its totient is φ = 72502275900.

The previous prime is 72505732121. The next prime is 72505732183. The reversal of 72505732157 is 75123750527.

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 72505732157 - 2¹⁴ = 72505715773 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 (72505732357) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1696469 + ... + 1738682.

It is an arithmetic number, because the mean of its divisors is an integer number (18127297104).

Almost surely, 2^72505732157 is an apocalyptic number.

It is an amenable number.

72505732157 is a deficient number, since it is larger than the sum of its proper divisors (3456259).

72505732157 is a wasteful number, since it uses less digits than its factorization.

72505732157 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3456258.

The product of its (nonzero) digits is 514500, while the sum is 44.

The spelling of 72505732157 in words is "seventy-two billion, five hundred five million, seven hundred thirty-two thousand, one hundred fifty-seven".