155623681 has 8 divisors (see below), whose sum is σ = 162970560. Its totient is φ = 148325232.

The previous prime is 155623669. The next prime is 155623687. The reversal of 155623681 is 186326551.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 155623681 - 2⁵ = 155623649 is a prime.

It is a super-2 number, since 2×155623681² = 48437460175979522, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 155623681.

It is not an unprimeable number, because it can be changed into a prime (155623687) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5446 + ... + 18463.

It is an arithmetic number, because the mean of its divisors is an integer number (20371320).

Almost surely, 2^155623681 is an apocalyptic number.

It is an amenable number.

155623681 is a deficient number, since it is larger than the sum of its proper divisors (7346879).

155623681 is a wasteful number, since it uses less digits than its factorization.

155623681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24215.

The product of its digits is 43200, while the sum is 37.

The square root of 155623681 is about 12474.9220839250. The cubic root of 155623681 is about 537.8880483189. Note that the first 3 decimals are identical.

The spelling of 155623681 in words is "one hundred fifty-five million, six hundred twenty-three thousand, six hundred eighty-one".