1601661051 has 24 divisors (see below), whose sum is σ = 2416620960. Its totient is φ = 1020281856.

The previous prime is 1601661041. The next prime is 1601661053. The reversal of 1601661051 is 1501661061.

1601661051 is a `hidden beast` number, since 1 + 601 + 6 + 6 + 1 + 0 + 51 = 666.

It is not a de Polignac number, because 1601661051 - 2⁶ = 1601660987 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1601661053) 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, 226075 + ... + 233051.

It is an arithmetic number, because the mean of its divisors is an integer number (100692540).

Almost surely, 2^1601661051 is an apocalyptic number.

1601661051 is a deficient number, since it is larger than the sum of its proper divisors (814959909).

1601661051 is a wasteful number, since it uses less digits than its factorization.

1601661051 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8115 (or 8112 counting only the distinct ones).

The product of its (nonzero) digits is 1080, while the sum is 27.

The square root of 1601661051 is about 40020.7577514469. The cubic root of 1601661051 is about 1170.0117005185.

The spelling of 1601661051 in words is "one billion, six hundred one million, six hundred sixty-one thousand, fifty-one".