11947780919 has 8 divisors (see below), whose sum is σ = 12067859232. Its totient is φ = 11827781280.

The previous prime is 11947780913. The next prime is 11947780973. The reversal of 11947780919 is 91908774911.

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 11947780919 - 2¹⁶ = 11947715383 is a prime.

It is a super-2 number, since 2×11947780919² (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 (11947780913) 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, 313757 + ... + 349769.

It is an arithmetic number, because the mean of its divisors is an integer number (1508482404).

Almost surely, 2^11947780919 is an apocalyptic number.

11947780919 is a deficient number, since it is larger than the sum of its proper divisors (120078313).

11947780919 is a wasteful number, since it uses less digits than its factorization.

11947780919 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39337.

The product of its (nonzero) digits is 1143072, while the sum is 56.

The spelling of 11947780919 in words is "eleven billion, nine hundred forty-seven million, seven hundred eighty thousand, nine hundred nineteen".