11621751667 has 4 divisors (see below), whose sum is σ = 12305384136. Its totient is φ = 10938119200.

The previous prime is 11621751643. The next prime is 11621751671. The reversal of 11621751667 is 76615712611.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 76615712611 = 821 ⋅93319991.

It is a cyclic number.

It is not a de Polignac number, because 11621751667 - 2⁷ = 11621751539 is a prime.

It is a super-2 number, since 2×11621751667² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11621754667) 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, 341816209 + ... + 341816242.

It is an arithmetic number, because the mean of its divisors is an integer number (3076346034).

Almost surely, 2^11621751667 is an apocalyptic number.

11621751667 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

11621751667 is a deficient number, since it is larger than the sum of its proper divisors (683632469).

11621751667 is an equidigital number, since it uses as much as digits as its factorization.

11621751667 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 683632468.

The product of its digits is 105840, while the sum is 43.

The spelling of 11621751667 in words is "eleven billion, six hundred twenty-one million, seven hundred fifty-one thousand, six hundred sixty-seven".