215605223993 has 2 divisors, whose sum is σ = 215605223994. Its totient is φ = 215605223992.

The previous prime is 215605223989. The next prime is 215605224019. The reversal of 215605223993 is 399322506512.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 129868699129 + 85736524864 = 360373^2 + 292808^2 .

It is a cyclic number.

It is not a de Polignac number, because 215605223993 - 2² = 215605223989 is a prime.

It is a super-2 number, since 2×215605223993² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (215605223693) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 107802611996 + 107802611997.

It is an arithmetic number, because the mean of its divisors is an integer number (107802611997).

Almost surely, 2^215605223993 is an apocalyptic number.

It is an amenable number.

215605223993 is a deficient number, since it is larger than the sum of its proper divisors (1).

215605223993 is an equidigital number, since it uses as much as digits as its factorization.

215605223993 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 874800, while the sum is 47.

The spelling of 215605223993 in words is "two hundred fifteen billion, six hundred five million, two hundred twenty-three thousand, nine hundred ninety-three".