155381396918 has 16 divisors (see below), whose sum is σ = 261132373584. Its totient is φ = 68719044960.

The previous prime is 155381396917. The next prime is 155381396923. The reversal of 155381396918 is 819693183551.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (155381396917) 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, 95442305 + ... + 95443932.

It is an arithmetic number, because the mean of its divisors is an integer number (16320773349).

Almost surely, 2^155381396918 is an apocalyptic number.

155381396918 is a deficient number, since it is larger than the sum of its proper divisors (105750976666).

155381396918 is a wasteful number, since it uses less digits than its factorization.

155381396918 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 190886287.

The product of its digits is 6998400, while the sum is 59.

The spelling of 155381396918 in words is "one hundred fifty-five billion, three hundred eighty-one million, three hundred ninety-six thousand, nine hundred eighteen".