155621152436 has 6 divisors (see below), whose sum is σ = 272337016770. Its totient is φ = 77810576216.

The previous prime is 155621152433. The next prime is 155621152451. The reversal of 155621152436 is 634251126551.

It can be written as a sum of positive squares in only one way, i.e., 154522892836 + 1098259600 = 393094^2 + 33140^2 .

It is a junction number, because it is equal to n+sod(n) for n = 155621152393 and 155621152402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (155621152433) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19452644051 + ... + 19452644058.

It is an arithmetic number, because the mean of its divisors is an integer number (45389502795).

Almost surely, 2^155621152436 is an apocalyptic number.

It is an amenable number.

155621152436 is a deficient number, since it is larger than the sum of its proper divisors (116715864334).

155621152436 is a wasteful number, since it uses less digits than its factorization.

155621152436 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38905288113 (or 38905288111 counting only the distinct ones).

The product of its digits is 216000, while the sum is 41.

Adding to 155621152436 its reverse (634251126551), we get a palindrome (789872278987).

The spelling of 155621152436 in words is "one hundred fifty-five billion, six hundred twenty-one million, one hundred fifty-two thousand, four hundred thirty-six".