155661396 has 24 divisors (see below), whose sum is σ = 396229344. Its totient is φ = 47170080.

The previous prime is 155661377. The next prime is 155661403. The reversal of 155661396 is 693166551.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 589495 + ... + 589758.

It is an arithmetic number, because the mean of its divisors is an integer number (16509556).

Almost surely, 2^155661396 is an apocalyptic number.

It is an amenable number.

155661396 is an abundant number, since it is smaller than the sum of its proper divisors (240567948).

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

155661396 is a wasteful number, since it uses less digits than its factorization.

155661396 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1179271 (or 1179269 counting only the distinct ones).

The product of its digits is 145800, while the sum is 42.

The square root of 155661396 is about 12476.4336250388. The cubic root of 155661396 is about 537.9314967389.

The spelling of 155661396 in words is "one hundred fifty-five million, six hundred sixty-one thousand, three hundred ninety-six".