1661155929 has 6 divisors (see below), whose sum is σ = 2399447466. Its totient is φ = 1107437280.

The previous prime is 1661155913. The next prime is 1661155957. The reversal of 1661155929 is 9295511661.

It is a happy number.

1661155929 is a `hidden beast` number, since 1 + 6 + 611 + 5 + 5 + 9 + 29 = 666.

It can be written as a sum of positive squares in only one way, i.e., 1644140304 + 17015625 = 40548^2 + 4125^2 .

It is not a de Polignac number, because 1661155929 - 2⁴ = 1661155913 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1661155829) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 92286432 + ... + 92286449.

It is an arithmetic number, because the mean of its divisors is an integer number (399907911).

Almost surely, 2^1661155929 is an apocalyptic number.

It is an amenable number.

1661155929 is a deficient number, since it is larger than the sum of its proper divisors (738291537).

1661155929 is a wasteful number, since it uses less digits than its factorization.

1661155929 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 184572887 (or 184572884 counting only the distinct ones).

The product of its digits is 145800, while the sum is 45.

The square root of 1661155929 is about 40757.2806870135. The cubic root of 1661155929 is about 1184.3229182306.

The spelling of 1661155929 in words is "one billion, six hundred sixty-one million, one hundred fifty-five thousand, nine hundred twenty-nine".