11764215345521 has 2 divisors, whose sum is σ = 11764215345522. Its totient is φ = 11764215345520.

The previous prime is 11764215345517. The next prime is 11764215345529. The reversal of 11764215345521 is 12554351246711.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11298579704896 + 465635640625 = 3361336^2 + 682375^2 .

It is a cyclic number.

It is not a de Polignac number, because 11764215345521 - 2² = 11764215345517 is a prime.

It is a super-2 number, since 2×11764215345521² (a number of 27 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (11764215345529) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5882107672760 + 5882107672761.

It is an arithmetic number, because the mean of its divisors is an integer number (5882107672761).

Almost surely, 2^{11764215345521} is an apocalyptic number.

It is an amenable number.

11764215345521 is a deficient number, since it is larger than the sum of its proper divisors (1).

11764215345521 is an equidigital number, since it uses as much as digits as its factorization.

11764215345521 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1008000, while the sum is 47.

The spelling of 11764215345521 in words is "eleven trillion, seven hundred sixty-four billion, two hundred fifteen million, three hundred forty-five thousand, five hundred twenty-one".