155145978 has 96 divisors (see below), whose sum is σ = 392648256. Its totient is φ = 43835904.

The previous prime is 155145973. The next prime is 155145983. The reversal of 155145978 is 879541551.

155145978 is a `hidden beast` number, since 1 + 5 + 51 + 4 + 597 + 8 = 666.

It is an interprime number because it is at equal distance from previous prime (155145973) and next prime (155145983).

It is not an unprimeable number, because it can be changed into a prime (155145973) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 170601 + ... + 171507.

It is an arithmetic number, because the mean of its divisors is an integer number (4090086).

Almost surely, 2^155145978 is an apocalyptic number.

155145978 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 155145978, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (196324128).

155145978 is an abundant number, since it is smaller than the sum of its proper divisors (237502278).

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

155145978 is a wasteful number, since it uses less digits than its factorization.

155145978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 988 (or 985 counting only the distinct ones).

The product of its digits is 252000, while the sum is 45.

The square root of 155145978 is about 12455.7608358542. The cubic root of 155145978 is about 537.3371165364.

The spelling of 155145978 in words is "one hundred fifty-five million, one hundred forty-five thousand, nine hundred seventy-eight".