155320644402 has 192 divisors, whose sum is σ = 442367677440. Its totient is φ = 38157609600.

The previous prime is 155320644397. The next prime is 155320644433. The reversal of 155320644402 is 204446023551.

155320644402 is a `hidden beast` number, since 1 + 5 + 5 + 3 + 2 + 0 + 644 + 4 + 0 + 2 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 17402313 + ... + 17411235.

It is an arithmetic number, because the mean of its divisors is an integer number (2303998320).

Almost surely, 2^155320644402 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 155320644402, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (221183838720).

155320644402 is an abundant number, since it is smaller than the sum of its proper divisors (287047033038).

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

155320644402 is a wasteful number, since it uses less digits than its factorization.

155320644402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9629 (or 9626 counting only the distinct ones).

The product of its (nonzero) digits is 115200, while the sum is 36.

Adding to 155320644402 its reverse (204446023551), we get a palindrome (359766667953).

The spelling of 155320644402 in words is "one hundred fifty-five billion, three hundred twenty million, six hundred forty-four thousand, four hundred two".