11551520401655 has 8 divisors (see below), whose sum is σ = 14928118672992. Its totient is φ = 8530353527328.

The previous prime is 11551520401643. The next prime is 11551520401661. The reversal of 11551520401655 is 55610402515511.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 11551520401655 - 2⁶ = 11551520401591 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 88857849179 + ... + 88857849308.

It is an arithmetic number, because the mean of its divisors is an integer number (1866014834124).

Almost surely, 2^{11551520401655} is an apocalyptic number.

11551520401655 is a deficient number, since it is larger than the sum of its proper divisors (3376598271337).

11551520401655 is a wasteful number, since it uses less digits than its factorization.

11551520401655 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 177715698505.

The product of its (nonzero) digits is 150000, while the sum is 41.

The spelling of 11551520401655 in words is "eleven trillion, five hundred fifty-one billion, five hundred twenty million, four hundred one thousand, six hundred fifty-five".