72235163257 has 4 divisors (see below), whose sum is σ = 72240765840. Its totient is φ = 72229560676.

The previous prime is 72235163239. The next prime is 72235163263. The reversal of 72235163257 is 75236153227.

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: 75236153227 = 487 ⋅154489021.

It is a cyclic number.

It is not a de Polignac number, because 72235163257 - 2¹⁵ = 72235130489 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72235163207) 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, 2781907 + ... + 2807752.

It is an arithmetic number, because the mean of its divisors is an integer number (18060191460).

Almost surely, 2^72235163257 is an apocalyptic number.

It is an amenable number.

72235163257 is a deficient number, since it is larger than the sum of its proper divisors (5602583).

72235163257 is a wasteful number, since it uses less digits than its factorization.

72235163257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5602582.

The product of its digits is 529200, while the sum is 43.

The spelling of 72235163257 in words is "seventy-two billion, two hundred thirty-five million, one hundred sixty-three thousand, two hundred fifty-seven".