1011665601 has 12 divisors (see below), whose sum is σ = 1495278928. Its totient is φ = 658758744.

The previous prime is 1011665593. The next prime is 1011665651. The reversal of 1011665601 is 1065661101.

1011665601 is a `hidden beast` number, since 1 + 0 + 1 + 1 + 6 + 656 + 0 + 1 = 666.

It is not a de Polignac number, because 1011665601 - 2³ = 1011665593 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1011665651) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1306675 + ... + 1307448.

Almost surely, 2^1011665601 is an apocalyptic number.

It is an amenable number.

1011665601 is a deficient number, since it is larger than the sum of its proper divisors (483613327).

1011665601 is a wasteful number, since it uses less digits than its factorization.

1011665601 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2614172 (or 2614169 counting only the distinct ones).

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

The square root of 1011665601 is about 31806.6911356714. The cubic root of 1011665601 is about 1003.8735102125.

The spelling of 1011665601 in words is "one billion, eleven million, six hundred sixty-five thousand, six hundred one".