72951778537 has 8 divisors (see below), whose sum is σ = 80371717632. Its totient is φ = 65663166000.

The previous prime is 72951778519. The next prime is 72951778541. The reversal of 72951778537 is 73587715927.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-72951778537 is a prime.

It is a super-2 number, since 2×72951778537² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72951778517) 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 in 7 ways as a sum of consecutive naturals, for example, 32830473 + ... + 32832694.

It is an arithmetic number, because the mean of its divisors is an integer number (10046464704).

Almost surely, 2^72951778537 is an apocalyptic number.

It is an amenable number.

72951778537 is a deficient number, since it is larger than the sum of its proper divisors (7419939095).

72951778537 is a wasteful number, since it uses less digits than its factorization.

72951778537 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65663279.

The product of its digits is 25930800, while the sum is 61.

The spelling of 72951778537 in words is "seventy-two billion, nine hundred fifty-one million, seven hundred seventy-eight thousand, five hundred thirty-seven".