72609889669949 has 4 divisors (see below), whose sum is σ = 73029600015036. Its totient is φ = 72190179324864.

The previous prime is 72609889669907. The next prime is 72609889669981. The reversal of 72609889669949 is 94996698890627.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 42580388383225 + 30029501286724 = 6525365^2 + 5479918^2 .

It is a cyclic number.

It is not a de Polignac number, because 72609889669949 - 2¹² = 72609889665853 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72609889669049) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 209855172284 + ... + 209855172629.

It is an arithmetic number, because the mean of its divisors is an integer number (18257400003759).

Almost surely, 2^{72609889669949} is an apocalyptic number.

It is an amenable number.

72609889669949 is a deficient number, since it is larger than the sum of its proper divisors (419710345087).

72609889669949 is a wasteful number, since it uses less digits than its factorization.

72609889669949 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 419710345086.

The product of its (nonzero) digits is 45712429056, while the sum is 92.

The spelling of 72609889669949 in words is "seventy-two trillion, six hundred nine billion, eight hundred eighty-nine million, six hundred sixty-nine thousand, nine hundred forty-nine".