155157396877440 has 448 divisors, whose sum is σ = 580309941781440. Its totient is φ = 39576376756224.

The previous prime is 155157396877429. The next prime is 155157396877517. The reversal of 155157396877440 is 44778693751551.

It is a happy number.

155157396877440 is a `hidden beast` number, since 1 + 5 + 5 + 1 + 57 + 3 + 9 + 68 + 77 + 440 = 666.

It is a Harshad number since it is a multiple of its sum of digits (72).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 55 ways as a sum of consecutive naturals, for example, 3501399 + ... + 17960361.

Almost surely, 2^{155157396877440} is an apocalyptic number.

155157396877440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 155157396877440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (290154970890720).

155157396877440 is an abundant number, since it is smaller than the sum of its proper divisors (425152544904000).

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

155157396877440 is an equidigital number, since it uses as much as digits as its factorization.

155157396877440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14459023 (or 14458996 counting only the distinct ones).

The product of its (nonzero) digits is 889056000, while the sum is 72.

The spelling of 155157396877440 in words is "one hundred fifty-five trillion, one hundred fifty-seven billion, three hundred ninety-six million, eight hundred seventy-seven thousand, four hundred forty".