155389821856 has 12 divisors (see below), whose sum is σ = 305923711842. Its totient is φ = 77694910912.

The previous prime is 155389821823. The next prime is 155389821893. The reversal of 155389821856 is 658128983551.

It can be written as a sum of positive squares in only one way, i.e., 91119459600 + 64270362256 = 301860^2 + 253516^2 .

It is a junction number, because it is equal to n+sod(n) for n = 155389821794 and 155389821803.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2427965935 + ... + 2427965998.

Almost surely, 2^155389821856 is an apocalyptic number.

155389821856 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

155389821856 is a deficient number, since it is larger than the sum of its proper divisors (150533889986).

155389821856 is an equidigital number, since it uses as much as digits as its factorization.

155389821856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4855931943 (or 4855931935 counting only the distinct ones).

The product of its digits is 20736000, while the sum is 61.

The spelling of 155389821856 in words is "one hundred fifty-five billion, three hundred eighty-nine million, eight hundred twenty-one thousand, eight hundred fifty-six".