72158687501 has 2 divisors, whose sum is σ = 72158687502. Its totient is φ = 72158687500.

The previous prime is 72158687477. The next prime is 72158687539. The reversal of 72158687501 is 10578685127.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 72143274025 + 15413476 = 268595^2 + 3926^2 .

It is an emirp because it is prime and its reverse (10578685127) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 72158687501 - 2⁶ = 72158687437 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 72158687501.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (72158687201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36079343750 + 36079343751.

It is an arithmetic number, because the mean of its divisors is an integer number (36079343751).

Almost surely, 2^72158687501 is an apocalyptic number.

It is an amenable number.

72158687501 is a deficient number, since it is larger than the sum of its proper divisors (1).

72158687501 is an equidigital number, since it uses as much as digits as its factorization.

72158687501 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 940800, while the sum is 50.

The spelling of 72158687501 in words is "seventy-two billion, one hundred fifty-eight million, six hundred eighty-seven thousand, five hundred one".