155643456 has 28 divisors (see below), whose sum is σ = 411807152. Its totient is φ = 51881088.

The previous prime is 155643451. The next prime is 155643473. The reversal of 155643456 is 654346551.

It is not an unprimeable number, because it can be changed into a prime (155643451) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 405130 + ... + 405513.

Almost surely, 2^155643456 is an apocalyptic number.

155643456 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

155643456 is an abundant number, since it is smaller than the sum of its proper divisors (256163696).

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

155643456 is an equidigital number, since it uses as much as digits as its factorization.

155643456 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 810658 (or 810648 counting only the distinct ones).

The product of its digits is 216000, while the sum is 39.

The square root of 155643456 is about 12475.7146488688. The cubic root of 155643456 is about 537.9108303822.

The spelling of 155643456 in words is "one hundred fifty-five million, six hundred forty-three thousand, four hundred fifty-six".