121557468315511 has 2 divisors, whose sum is σ = 121557468315512. Its totient is φ = 121557468315510.

The previous prime is 121557468315421. The next prime is 121557468315551. The reversal of 121557468315511 is 115513864755121.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-121557468315511 is a prime.

It is a super-3 number, since 3×121557468315511³ (a number of 43 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121557468315551) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60778734157755 + 60778734157756.

It is an arithmetic number, because the mean of its divisors is an integer number (60778734157756).

Almost surely, 2^{121557468315511} is an apocalyptic number.

121557468315511 is a deficient number, since it is larger than the sum of its proper divisors (1).

121557468315511 is an equidigital number, since it uses as much as digits as its factorization.

121557468315511 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5040000, while the sum is 55.

The spelling of 121557468315511 in words is "one hundred twenty-one trillion, five hundred fifty-seven billion, four hundred sixty-eight million, three hundred fifteen thousand, five hundred eleven".