11540721601 has 2 divisors, whose sum is σ = 11540721602. Its totient is φ = 11540721600.

The previous prime is 11540721587. The next prime is 11540721611. The reversal of 11540721601 is 10612704511.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11453280400 + 87441201 = 107020^2 + 9351^2 .

It is a cyclic number.

It is not a de Polignac number, because 11540721601 - 2³³ = 2950787009 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 11540721601.

It is not a weakly prime, because it can be changed into another prime (11540721611) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5770360800 + 5770360801.

It is an arithmetic number, because the mean of its divisors is an integer number (5770360801).

Almost surely, 2^11540721601 is an apocalyptic number.

It is an amenable number.

11540721601 is a deficient number, since it is larger than the sum of its proper divisors (1).

11540721601 is an equidigital number, since it uses as much as digits as its factorization.

11540721601 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1680, while the sum is 28.

The spelling of 11540721601 in words is "eleven billion, five hundred forty million, seven hundred twenty-one thousand, six hundred one".