72431117669 has 2 divisors, whose sum is σ = 72431117670. Its totient is φ = 72431117668.

The previous prime is 72431117639. The next prime is 72431117719. The reversal of 72431117669 is 96671113427.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 66013024900 + 6418092769 = 256930^2 + 80113^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-72431117669 is a prime.

It is a super-2 number, since 2×72431117669² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (72431117639) 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 as a sum of consecutive naturals, namely, 36215558834 + 36215558835.

It is an arithmetic number, because the mean of its divisors is an integer number (36215558835).

Almost surely, 2^72431117669 is an apocalyptic number.

It is an amenable number.

72431117669 is a deficient number, since it is larger than the sum of its proper divisors (1).

72431117669 is an equidigital number, since it uses as much as digits as its factorization.

72431117669 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 381024, while the sum is 47.

The spelling of 72431117669 in words is "seventy-two billion, four hundred thirty-one million, one hundred seventeen thousand, six hundred sixty-nine".