1101553661 has 24 divisors (see below), whose sum is σ = 1262875680. Its totient is φ = 958741056.

The previous prime is 1101553639. The next prime is 1101553667. The reversal of 1101553661 is 1663551011.

It is not a de Polignac number, because 1101553661 - 2¹⁰ = 1101552637 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (29).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1101553667) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 208130 + ... + 213356.

It is an arithmetic number, because the mean of its divisors is an integer number (52619820).

Almost surely, 2^1101553661 is an apocalyptic number.

It is an amenable number.

1101553661 is a deficient number, since it is larger than the sum of its proper divisors (161322019).

1101553661 is a wasteful number, since it uses less digits than its factorization.

1101553661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5325 (or 5312 counting only the distinct ones).

The product of its (nonzero) digits is 2700, while the sum is 29.

The square root of 1101553661 is about 33189.6619597127. The cubic root of 1101553661 is about 1032.7658908694.

The spelling of 1101553661 in words is "one billion, one hundred one million, five hundred fifty-three thousand, six hundred sixty-one".