155661236 has 6 divisors (see below), whose sum is σ = 272407170. Its totient is φ = 77830616.

The previous prime is 155661211. The next prime is 155661269. The reversal of 155661236 is 632166551.

155661236 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 117592336 + 38068900 = 10844^2 + 6170^2 .

It is a junction number, because it is equal to n+sod(n) for n = 155661196 and 155661205.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19457651 + ... + 19457658.

It is an arithmetic number, because the mean of its divisors is an integer number (45401195).

Almost surely, 2^155661236 is an apocalyptic number.

It is an amenable number.

155661236 is a deficient number, since it is larger than the sum of its proper divisors (116745934).

155661236 is a wasteful number, since it uses less digits than its factorization.

155661236 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38915313 (or 38915311 counting only the distinct ones).

The product of its digits is 32400, while the sum is 35.

The square root of 155661236 is about 12476.4272129484. The cubic root of 155661236 is about 537.9313124306.

The spelling of 155661236 in words is "one hundred fifty-five million, six hundred sixty-one thousand, two hundred thirty-six".