155351661 has 24 divisors (see below), whose sum is σ = 223839840. Its totient is φ = 95791872.

The previous prime is 155351659. The next prime is 155351663. The reversal of 155351661 is 166153551.

155351661 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (155351659) and next prime (155351663).

It is not a de Polignac number, because 155351661 - 2¹ = 155351659 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (155351663) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 49635 + ... + 52671.

It is an arithmetic number, because the mean of its divisors is an integer number (9326660).

Almost surely, 2^155351661 is an apocalyptic number.

It is an amenable number.

155351661 is a deficient number, since it is larger than the sum of its proper divisors (68488179).

155351661 is a wasteful number, since it uses less digits than its factorization.

155351661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3133 (or 3116 counting only the distinct ones).

The product of its digits is 13500, while the sum is 33.

The square root of 155351661 is about 12464.0146421608. The cubic root of 155351661 is about 537.5744678508.

The spelling of 155351661 in words is "one hundred fifty-five million, three hundred fifty-one thousand, six hundred sixty-one".