11555505501 has 8 divisors (see below), whose sum is σ = 15414330624. Its totient is φ = 7700175360.

The previous prime is 11555505499. The next prime is 11555505517. The reversal of 11555505501 is 10550555511.

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

It is not a de Polignac number, because 11555505501 - 2¹ = 11555505499 is a prime.

It is a super-2 number, since 2×11555505501² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11555505551) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 866020 + ... + 879261.

It is an arithmetic number, because the mean of its divisors is an integer number (1926791328).

Almost surely, 2^11555505501 is an apocalyptic number.

It is an amenable number.

11555505501 is a deficient number, since it is larger than the sum of its proper divisors (3858825123).

11555505501 is a wasteful number, since it uses less digits than its factorization.

11555505501 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1747491.

The product of its (nonzero) digits is 15625, while the sum is 33.

The spelling of 11555505501 in words is "eleven billion, five hundred fifty-five million, five hundred five thousand, five hundred one".