72549049815 has 64 divisors (see below), whose sum is σ = 143973434880. Its totient is φ = 34357236480.

The previous prime is 72549049801. The next prime is 72549049823. The reversal of 72549049815 is 51894094527.

It is a happy number.

72549049815 is a `hidden beast` number, since 7 + 2 + 54 + 90 + 498 + 15 = 666.

It is not a de Polignac number, because 72549049815 - 2¹² = 72549045719 is a prime.

It is a congruent number.

It is an unprimeable number.

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 63 ways as a sum of consecutive naturals, for example, 504222 + ... + 631931.

It is an arithmetic number, because the mean of its divisors is an integer number (2249584920).

Almost surely, 2^72549049815 is an apocalyptic number.

72549049815 is a deficient number, since it is larger than the sum of its proper divisors (71424385065).

72549049815 is a wasteful number, since it uses less digits than its factorization.

72549049815 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1136221 (or 1136215 counting only the distinct ones).

The product of its (nonzero) digits is 3628800, while the sum is 54.

The spelling of 72549049815 in words is "seventy-two billion, five hundred forty-nine million, forty-nine thousand, eight hundred fifteen".