33220351993 has 2 divisors, whose sum is σ = 33220351994. Its totient is φ = 33220351992.

The previous prime is 33220351943. The next prime is 33220352017. The reversal of 33220351993 is 39915302233.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 23285844409 + 9934507584 = 152597^2 + 99672^2 .

It is a cyclic number.

It is not a de Polignac number, because 33220351993 - 2³³ = 24630417401 is a prime.

It is a super-2 number, since 2×33220351993² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (33220351943) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16610175996 + 16610175997.

It is an arithmetic number, because the mean of its divisors is an integer number (16610175997).

Almost surely, 2^33220351993 is an apocalyptic number.

It is an amenable number.

33220351993 is a deficient number, since it is larger than the sum of its proper divisors (1).

33220351993 is an equidigital number, since it uses as much as digits as its factorization.

33220351993 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 131220, while the sum is 40.

The spelling of 33220351993 in words is "thirty-three billion, two hundred twenty million, three hundred fifty-one thousand, nine hundred ninety-three".