11515011621643 has 16 divisors (see below), whose sum is σ = 11822290035840. Its totient is φ = 11210341441536.

The previous prime is 11515011621637. The next prime is 11515011621679. The reversal of 11515011621643 is 34612611051511.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11515011621643 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11515011627643) 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, 85172643 + ... + 85307731.

It is an arithmetic number, because the mean of its divisors is an integer number (738893127240).

Almost surely, 2^{11515011621643} is an apocalyptic number.

11515011621643 is a deficient number, since it is larger than the sum of its proper divisors (307278414197).

11515011621643 is a wasteful number, since it uses less digits than its factorization.

11515011621643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 144726.

The product of its (nonzero) digits is 21600, while the sum is 37.

The spelling of 11515011621643 in words is "eleven trillion, five hundred fifteen billion, eleven million, six hundred twenty-one thousand, six hundred forty-three".