11451581077 has 4 divisors (see below), whose sum is σ = 11717896960. Its totient is φ = 11185265196.

The previous prime is 11451581059. The next prime is 11451581087. The reversal of 11451581077 is 77018515411.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 77018515411 = 907 ⋅84915673.

It is a cyclic number.

It is not a de Polignac number, because 11451581077 - 2⁷ = 11451580949 is a prime.

It is a super-2 number, since 2×11451581077² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11451581047) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 133157877 + ... + 133157962.

It is an arithmetic number, because the mean of its divisors is an integer number (2929474240).

Almost surely, 2^11451581077 is an apocalyptic number.

It is an amenable number.

11451581077 is a deficient number, since it is larger than the sum of its proper divisors (266315883).

11451581077 is an equidigital number, since it uses as much as digits as its factorization.

11451581077 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 266315882.

The product of its (nonzero) digits is 39200, while the sum is 40.

The spelling of 11451581077 in words is "eleven billion, four hundred fifty-one million, five hundred eighty-one thousand, seventy-seven".