155151661 has 8 divisors (see below), whose sum is σ = 178592960. Its totient is φ = 132029568.

The previous prime is 155151649. The next prime is 155151691. The reversal of 155151661 is 166151551.

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 155151661 - 2¹⁹ = 154627373 is a prime.

It is a super-2 number, since 2×155151661² = 48144075822117842, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (155151631) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 78756 + ... + 80701.

It is an arithmetic number, because the mean of its divisors is an integer number (22324120).

Almost surely, 2^155151661 is an apocalyptic number.

It is an amenable number.

155151661 is a deficient number, since it is larger than the sum of its proper divisors (23441299).

155151661 is a wasteful number, since it uses less digits than its factorization.

155151661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 159603.

The product of its digits is 4500, while the sum is 31.

The square root of 155151661 is about 12455.9889611383. The cubic root of 155151661 is about 537.3436773458.

The spelling of 155151661 in words is "one hundred fifty-five million, one hundred fifty-one thousand, six hundred sixty-one".