11955780038 has 4 divisors (see below), whose sum is σ = 17933670060. Its totient is φ = 5977890018.

The previous prime is 11955779989. The next prime is 11955780059. The reversal of 11955780038 is 83008755911.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 11955779974 and 11955780001.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2988945008 + ... + 2988945011.

It is an arithmetic number, because the mean of its divisors is an integer number (4483417515).

Almost surely, 2^11955780038 is an apocalyptic number.

11955780038 is a deficient number, since it is larger than the sum of its proper divisors (5977890022).

11955780038 is an equidigital number, since it uses as much as digits as its factorization.

11955780038 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5977890021.

The product of its (nonzero) digits is 302400, while the sum is 47.

The spelling of 11955780038 in words is "eleven billion, nine hundred fifty-five million, seven hundred eighty thousand, thirty-eight".