7218040123501 has 2 divisors, whose sum is σ = 7218040123502. Its totient is φ = 7218040123500.

The previous prime is 7218040123487. The next prime is 7218040123507. The reversal of 7218040123501 is 1053210408127.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6636368493225 + 581671630276 = 2576115^2 + 762674^2 .

It is a cyclic number.

It is not a de Polignac number, because 7218040123501 - 2⁹ = 7218040122989 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7218040123507) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3609020061750 + 3609020061751.

It is an arithmetic number, because the mean of its divisors is an integer number (3609020061751).

Almost surely, 2^{7218040123501} is an apocalyptic number.

It is an amenable number.

7218040123501 is a deficient number, since it is larger than the sum of its proper divisors (1).

7218040123501 is an equidigital number, since it uses as much as digits as its factorization.

7218040123501 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 13440, while the sum is 34.

The spelling of 7218040123501 in words is "seven trillion, two hundred eighteen billion, forty million, one hundred twenty-three thousand, five hundred one".