11540511621 has 24 divisors (see below), whose sum is σ = 16769231960. Its totient is φ = 7647768576.

The previous prime is 11540511571. The next prime is 11540511629. The reversal of 11540511621 is 12611504511.

11540511621 is a `hidden beast` number, since 1 + 1 + 540 + 5 + 116 + 2 + 1 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 471367521 + 11069144100 = 21711^2 + 105210^2 .

It is not a de Polignac number, because 11540511621 - 2¹⁵ = 11540478853 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11540511629) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3710415 + ... + 3713523.

Almost surely, 2^11540511621 is an apocalyptic number.

It is an amenable number.

11540511621 is a deficient number, since it is larger than the sum of its proper divisors (5228720339).

11540511621 is a wasteful number, since it uses less digits than its factorization.

11540511621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5445 (or 5442 counting only the distinct ones).

The product of its (nonzero) digits is 1200, while the sum is 27.

The spelling of 11540511621 in words is "eleven billion, five hundred forty million, five hundred eleven thousand, six hundred twenty-one".