11978478207 has 14 divisors (see below), whose sum is σ = 17959502712. Its totient is φ = 7985651652.

The previous prime is 11978478157. The next prime is 11978478209. The reversal of 11978478207 is 70287487911.

It is not a de Polignac number, because 11978478207 - 2⁶ = 11978478143 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11978478209) by changing a digit.

It is a polite number, since it can be written in 13 ways as a sum of consecutive naturals, for example, 8214963 + ... + 8216420.

Almost surely, 2^11978478207 is an apocalyptic number.

11978478207 is a deficient number, since it is larger than the sum of its proper divisors (5981024505).

11978478207 is an frugal number, since it uses more digits than its factorization.

11978478207 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16431401 (or 16431386 counting only the distinct ones).

The product of its (nonzero) digits is 1580544, while the sum is 54.

The spelling of 11978478207 in words is "eleven billion, nine hundred seventy-eight million, four hundred seventy-eight thousand, two hundred seven".