11955454551 has 8 divisors (see below), whose sum is σ = 17711784560. Its totient is φ = 7970303016.

The previous prime is 11955454547. The next prime is 11955454613. The reversal of 11955454551 is 15545455911.

11955454551 is a `hidden beast` number, since 1 + 1 + 9 + 5 + 54 + 545 + 51 = 666.

It is not a de Polignac number, because 11955454551 - 2² = 11955454547 is a prime.

It is a super-2 number, since 2×11955454551² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 11955454497 and 11955454506.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11955414551) 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, 221397280 + ... + 221397333.

It is an arithmetic number, because the mean of its divisors is an integer number (2213973070).

Almost surely, 2^11955454551 is an apocalyptic number.

11955454551 is a deficient number, since it is larger than the sum of its proper divisors (5756330009).

11955454551 is an equidigital number, since it uses as much as digits as its factorization.

11955454551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 442794622 (or 442794616 counting only the distinct ones).

The product of its digits is 450000, while the sum is 45.

The spelling of 11955454551 in words is "eleven billion, nine hundred fifty-five million, four hundred fifty-four thousand, five hundred fifty-one".