155665671 has 16 divisors (see below), whose sum is σ = 238136064. Its totient is φ = 88602624.

The previous prime is 155665667. The next prime is 155665691. The reversal of 155665671 is 176566551.

It is not a de Polignac number, because 155665671 - 2² = 155665667 is a prime.

It is a super-2 number, since 2×155665671² = 48463602255760482, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (155665661) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9025 + ... + 19818.

It is an arithmetic number, because the mean of its divisors is an integer number (14883504).

Almost surely, 2^155665671 is an apocalyptic number.

155665671 is a deficient number, since it is larger than the sum of its proper divisors (82470393).

155665671 is a wasteful number, since it uses less digits than its factorization.

155665671 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29110.

The product of its digits is 189000, while the sum is 42.

The square root of 155665671 is about 12476.6049468595. The cubic root of 155665671 is about 537.9364211800.

The spelling of 155665671 in words is "one hundred fifty-five million, six hundred sixty-five thousand, six hundred seventy-one".