155778712938 has 24 divisors (see below), whose sum is σ = 345369861408. Its totient is φ = 50718650472.

The previous prime is 155778712933. The next prime is 155778712949. The reversal of 155778712938 is 839217877551.

155778712938 is a `hidden beast` number, since 1 + 5 + 577 + 8 + 7 + 1 + 29 + 38 = 666.

155778712938 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (155778712933) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 100631470 + ... + 100633017.

It is an arithmetic number, because the mean of its divisors is an integer number (14390410892).

Almost surely, 2^155778712938 is an apocalyptic number.

155778712938 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

155778712938 is an abundant number, since it is smaller than the sum of its proper divisors (189591148470).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

155778712938 is a wasteful number, since it uses less digits than its factorization.

155778712938 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 201264538 (or 201264535 counting only the distinct ones).

The product of its digits is 29635200, while the sum is 63.

The spelling of 155778712938 in words is "one hundred fifty-five billion, seven hundred seventy-eight million, seven hundred twelve thousand, nine hundred thirty-eight".