72570018641 has 4 divisors (see below), whose sum is σ = 72570734400. Its totient is φ = 72569302884.

The previous prime is 72570018629. The next prime is 72570018643. The reversal of 72570018641 is 14681007527.

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 a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 14681007527 = 42967 ⋅341681.

It is a cyclic number.

It is not a de Polignac number, because 72570018641 - 2²² = 72565824337 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72570018643) 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, 174461 + ... + 419018.

It is an arithmetic number, because the mean of its divisors is an integer number (18142683600).

Almost surely, 2^72570018641 is an apocalyptic number.

It is an amenable number.

72570018641 is a deficient number, since it is larger than the sum of its proper divisors (715759).

72570018641 is a wasteful number, since it uses less digits than its factorization.

72570018641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 715758.

The product of its (nonzero) digits is 94080, while the sum is 41.

The spelling of 72570018641 in words is "seventy-two billion, five hundred seventy million, eighteen thousand, six hundred forty-one".