11777651721 has 32 divisors (see below), whose sum is σ = 19275571200. Its totient is φ = 7047602640.

The previous prime is 11777651671. The next prime is 11777651741. The reversal of 11777651721 is 12715677711.

It is not a de Polignac number, because 11777651721 - 2¹⁰ = 11777650697 is a prime.

It is a super-2 number, since 2×11777651721² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (11777651741) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 227521 + ... + 274446.

It is an arithmetic number, because the mean of its divisors is an integer number (602361600).

Almost surely, 2^11777651721 is an apocalyptic number.

11777651721 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

11777651721 is a deficient number, since it is larger than the sum of its proper divisors (7497919479).

11777651721 is a wasteful number, since it uses less digits than its factorization.

11777651721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 502066 (or 502060 counting only the distinct ones).

The product of its digits is 144060, while the sum is 45.

The spelling of 11777651721 in words is "eleven billion, seven hundred seventy-seven million, six hundred fifty-one thousand, seven hundred twenty-one".