11661016551 has 16 divisors (see below), whose sum is σ = 16131928800. Its totient is φ = 7483650048.

The previous prime is 11661016501. The next prime is 11661016553. The reversal of 11661016551 is 15561016611.

It is not a de Polignac number, because 11661016551 - 2¹⁵ = 11660983783 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11661016553) 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, 169546 + ... + 228183.

It is an arithmetic number, because the mean of its divisors is an integer number (1008245550).

Almost surely, 2^11661016551 is an apocalyptic number.

11661016551 is a deficient number, since it is larger than the sum of its proper divisors (4470912249).

11661016551 is a wasteful number, since it uses less digits than its factorization.

11661016551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 398098.

The product of its (nonzero) digits is 5400, while the sum is 33.

The spelling of 11661016551 in words is "eleven billion, six hundred sixty-one million, sixteen thousand, five hundred fifty-one".