1011100500561 has 24 divisors (see below), whose sum is σ = 1507474576480. Its totient is φ = 601025674752.

The previous prime is 1011100500541. The next prime is 1011100500583. The reversal of 1011100500561 is 1650050011101.

It is a happy number.

It is not a de Polignac number, because 1011100500561 - 2¹⁰ = 1011100499537 is a prime.

It is a super-2 number, since 2×1011100500561² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1011100500541) 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, 30673156 + ... + 30706101.

Almost surely, 2^{1011100500561} is an apocalyptic number.

It is an amenable number.

1011100500561 is a deficient number, since it is larger than the sum of its proper divisors (496374075919).

1011100500561 is a wasteful number, since it uses less digits than its factorization.

1011100500561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61379313 (or 61379296 counting only the distinct ones).

The product of its (nonzero) digits is 150, while the sum is 21.

Adding to 1011100500561 its reverse (1650050011101), we get a palindrome (2661150511662).

The spelling of 1011100500561 in words is "one trillion, eleven billion, one hundred million, five hundred thousand, five hundred sixty-one".