155668631 has 8 divisors (see below), whose sum is σ = 159804480. Its totient is φ = 151587072.

The previous prime is 155668621. The next prime is 155668649. The reversal of 155668631 is 136866551.

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 155668631 - 2¹⁰ = 155667607 is a prime.

It is a super-2 number, since 2×155668631² = 48465445354828322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (155668621) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7730 + ... + 19263.

It is an arithmetic number, because the mean of its divisors is an integer number (19975560).

Almost surely, 2^155668631 is an apocalyptic number.

155668631 is a deficient number, since it is larger than the sum of its proper divisors (4135849).

155668631 is an equidigital number, since it uses as much as digits as its factorization.

155668631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27145.

The product of its digits is 129600, while the sum is 41.

The square root of 155668631 is about 12476.7235683091. The cubic root of 155668631 is about 537.9398307986.

The spelling of 155668631 in words is "one hundred fifty-five million, six hundred sixty-eight thousand, six hundred thirty-one".