11978061977 has 16 divisors (see below), whose sum is σ = 14546828160. Its totient is φ = 9628063488.

The previous prime is 11978061971. The next prime is 11978062021. The reversal of 11978061977 is 77916087911.

It is a cyclic number.

It is not a de Polignac number, because 11978061977 - 2⁴ = 11978061961 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11978061971) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 148727 + ... + 214652.

It is an arithmetic number, because the mean of its divisors is an integer number (909176760).

Almost surely, 2^11978061977 is an apocalyptic number.

11978061977 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

It is an amenable number.

11978061977 is a deficient number, since it is larger than the sum of its proper divisors (2568766183).

11978061977 is a wasteful number, since it uses less digits than its factorization.

11978061977 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 363680.

The product of its (nonzero) digits is 1333584, while the sum is 56.

The spelling of 11978061977 in words is "eleven billion, nine hundred seventy-eight million, sixty-one thousand, nine hundred seventy-seven".