11561000451 has 128 divisors (see below), whose sum is σ = 21372567552. Its totient is φ = 5365440000.

The previous prime is 11561000401. The next prime is 11561000483. The reversal of 11561000451 is 15400016511.

It is not a de Polignac number, because 11561000451 - 2⁷ = 11561000323 is a prime.

It is not an unprimeable number, because it can be changed into a prime (11561000401) by changing a digit.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 14254836 + ... + 14255646.

It is an arithmetic number, because the mean of its divisors is an integer number (166973184).

Almost surely, 2^11561000451 is an apocalyptic number.

11561000451 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

11561000451 is a deficient number, since it is larger than the sum of its proper divisors (9811567101).

11561000451 is a wasteful number, since it uses less digits than its factorization.

11561000451 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 993.

The product of its (nonzero) digits is 600, while the sum is 24.

Adding to 11561000451 its reverse (15400016511), we get a palindrome (26961016962).

The spelling of 11561000451 in words is "eleven billion, five hundred sixty-one million, four hundred fifty-one", and thus it is an aban number.