72663389957 has 4 divisors (see below), whose sum is σ = 72663932736. Its totient is φ = 72662847180.

The previous prime is 72663389881. The next prime is 72663389959. The reversal of 72663389957 is 75998336627.

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: 75998336627 = 179 ⋅424571713.

It is a cyclic number.

It is not a de Polignac number, because 72663389957 - 2¹⁰ = 72663388933 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 72663389893 and 72663389902.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72663389959) 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, 88532 + ... + 391362.

It is an arithmetic number, because the mean of its divisors is an integer number (18165983184).

Almost surely, 2^72663389957 is an apocalyptic number.

It is an amenable number.

72663389957 is a deficient number, since it is larger than the sum of its proper divisors (542779).

72663389957 is a wasteful number, since it uses less digits than its factorization.

72663389957 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 542778.

The product of its digits is 102876480, while the sum is 65.

The spelling of 72663389957 in words is "seventy-two billion, six hundred sixty-three million, three hundred eighty-nine thousand, nine hundred fifty-seven".