11521554277 has 2 divisors, whose sum is σ = 11521554278. Its totient is φ = 11521554276.

The previous prime is 11521554263. The next prime is 11521554287. The reversal of 11521554277 is 77245512511.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6096642561 + 5424911716 = 78081^2 + 73654^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11521554277 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11521554227) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5760777138 + 5760777139.

It is an arithmetic number, because the mean of its divisors is an integer number (5760777139).

Almost surely, 2^11521554277 is an apocalyptic number.

It is an amenable number.

11521554277 is a deficient number, since it is larger than the sum of its proper divisors (1).

11521554277 is an equidigital number, since it uses as much as digits as its factorization.

11521554277 is an evil number, because the sum of its binary digits is even.

The product of its digits is 98000, while the sum is 40.

The spelling of 11521554277 in words is "eleven billion, five hundred twenty-one million, five hundred fifty-four thousand, two hundred seventy-seven".