78553111121011 has 2 divisors, whose sum is σ = 78553111121012. Its totient is φ = 78553111121010.

The previous prime is 78553111120963. The next prime is 78553111121029. The reversal of 78553111121011 is 11012111135587.

It is a strong prime.

It is an emirp because it is prime and its reverse (11012111135587) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 78553111121011 - 2¹⁷ = 78553110989939 is a prime.

It is not a weakly prime, because it can be changed into another prime (78553111121041) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39276555560505 + 39276555560506.

It is an arithmetic number, because the mean of its divisors is an integer number (39276555560506).

Almost surely, 2^{78553111121011} is an apocalyptic number.

78553111121011 is a deficient number, since it is larger than the sum of its proper divisors (1).

78553111121011 is an equidigital number, since it uses as much as digits as its factorization.

78553111121011 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8400, while the sum is 37.

Adding to 78553111121011 its reverse (11012111135587), we get a palindrome (89565222256598).

The spelling of 78553111121011 in words is "seventy-eight trillion, five hundred fifty-three billion, one hundred eleven million, one hundred twenty-one thousand, eleven".