121761544511 has 2 divisors, whose sum is σ = 121761544512. Its totient is φ = 121761544510.

The previous prime is 121761544433. The next prime is 121761544537. The reversal of 121761544511 is 115445167121.

It is a happy number.

It is a strong prime.

It is an emirp because it is prime and its reverse (115445167121) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 121761544511 - 2¹⁸ = 121761282367 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121761544571) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60880772255 + 60880772256.

It is an arithmetic number, because the mean of its divisors is an integer number (60880772256).

Almost surely, 2^121761544511 is an apocalyptic number.

121761544511 is a deficient number, since it is larger than the sum of its proper divisors (1).

121761544511 is an equidigital number, since it uses as much as digits as its factorization.

121761544511 is an evil number, because the sum of its binary digits is even.

The product of its digits is 33600, while the sum is 38.

The spelling of 121761544511 in words is "one hundred twenty-one billion, seven hundred sixty-one million, five hundred forty-four thousand, five hundred eleven".