11557335621 has 16 divisors (see below), whose sum is σ = 16981084736. Its totient is φ = 6946805376.

The previous prime is 11557335571. The next prime is 11557335631. The reversal of 11557335621 is 12653375511.

It is not a de Polignac number, because 11557335621 - 2⁶ = 11557335557 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 11557335621.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11557335631) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3444160 + ... + 3447513.

It is an arithmetic number, because the mean of its divisors is an integer number (1061317796).

Almost surely, 2^11557335621 is an apocalyptic number.

It is an amenable number.

11557335621 is a deficient number, since it is larger than the sum of its proper divisors (5423749115).

11557335621 is a wasteful number, since it uses less digits than its factorization.

11557335621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6891732.

The product of its digits is 94500, while the sum is 39.

The spelling of 11557335621 in words is "eleven billion, five hundred fifty-seven million, three hundred thirty-five thousand, six hundred twenty-one".