11611656616551 has 32 divisors (see below), whose sum is σ = 16476319641600. Its totient is φ = 7248686455296.

The previous prime is 11611656616541. The next prime is 11611656616559. The reversal of 11611656616551 is 15561665611611.

It is not a de Polignac number, because 11611656616551 - 2¹⁵ = 11611656583783 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is a junction number, because it is equal to n+sod(n) for n = 11611656616494 and 11611656616503.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11611656616559) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 256209145 + ... + 256254461.

It is an arithmetic number, because the mean of its divisors is an integer number (514884988800).

Almost surely, 2^{11611656616551} is an apocalyptic number.

11611656616551 is a deficient number, since it is larger than the sum of its proper divisors (4864663025049).

11611656616551 is a wasteful number, since it uses less digits than its factorization.

11611656616551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70783.

The product of its digits is 972000, while the sum is 51.

The spelling of 11611656616551 in words is "eleven trillion, six hundred eleven billion, six hundred fifty-six million, six hundred sixteen thousand, five hundred fifty-one".