11990780755 has 8 divisors (see below), whose sum is σ = 14390481600. Its totient is φ = 9591594816.

The previous prime is 11990780707. The next prime is 11990780761. The reversal of 11990780755 is 55708709911.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 11990780755 - 2¹¹ = 11990778707 is a prime.

It is a super-2 number, since 2×11990780755² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 75490 + ... + 172279.

It is an arithmetic number, because the mean of its divisors is an integer number (1798810200).

Almost surely, 2^11990780755 is an apocalyptic number.

11990780755 is a deficient number, since it is larger than the sum of its proper divisors (2399700845).

11990780755 is an equidigital number, since it uses as much as digits as its factorization.

11990780755 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 257453.

The product of its (nonzero) digits is 793800, while the sum is 52.

The spelling of 11990780755 in words is "eleven billion, nine hundred ninety million, seven hundred eighty thousand, seven hundred fifty-five".