72543526457 has 4 divisors (see below), whose sum is σ = 72547864656. Its totient is φ = 72539188260.

The previous prime is 72543526427. The next prime is 72543526459. The reversal of 72543526457 is 75462534527.

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 72543526457 - 2¹² = 72543522361 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72543526459) 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, 2143919 + ... + 2177492.

It is an arithmetic number, because the mean of its divisors is an integer number (18136966164).

Almost surely, 2^72543526457 is an apocalyptic number.

It is an amenable number.

72543526457 is a deficient number, since it is larger than the sum of its proper divisors (4338199).

72543526457 is a wasteful number, since it uses less digits than its factorization.

72543526457 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4338198.

The product of its digits is 7056000, while the sum is 50.

The spelling of 72543526457 in words is "seventy-two billion, five hundred forty-three million, five hundred twenty-six thousand, four hundred fifty-seven".