155656540 has 48 divisors (see below), whose sum is σ = 356313888. Its totient is φ = 56772864.

The previous prime is 155656519. The next prime is 155656547. The reversal of 155656540 is 45656551.

It is a Smith number, since the sum of its digits (37) coincides with the sum of the digits of its prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 155656540.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (155656547) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 17974 + ... + 25186.

It is an arithmetic number, because the mean of its divisors is an integer number (7423206).

Almost surely, 2^155656540 is an apocalyptic number.

155656540 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 155656540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (178156944).

155656540 is an abundant number, since it is smaller than the sum of its proper divisors (200657348).

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

155656540 is a wasteful number, since it uses less digits than its factorization.

155656540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7318 (or 7316 counting only the distinct ones).

The product of its (nonzero) digits is 90000, while the sum is 37.

The square root of 155656540 is about 12476.2390166268. The cubic root of 155656540 is about 537.9259029253.

The spelling of 155656540 in words is "one hundred fifty-five million, six hundred fifty-six thousand, five hundred forty".