1201666761 has 24 divisors (see below), whose sum is σ = 1841515520. Its totient is φ = 752957856.

The previous prime is 1201666751. The next prime is 1201666769. The reversal of 1201666761 is 1676661021.

It is not a de Polignac number, because 1201666761 - 2²³ = 1193278153 is a prime.

It is a super-2 number, since 2×1201666761² = 2888006008984462242, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1201666769) 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, 5950 + ... + 49383.

Almost surely, 2^1201666761 is an apocalyptic number.

It is an amenable number.

1201666761 is a deficient number, since it is larger than the sum of its proper divisors (639848759).

1201666761 is a wasteful number, since it uses less digits than its factorization.

1201666761 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55485 (or 55482 counting only the distinct ones).

The product of its (nonzero) digits is 18144, while the sum is 36.

The square root of 1201666761 is about 34665.0654261607. The cubic root of 1201666761 is about 1063.1503409732.

The spelling of 1201666761 in words is "one billion, two hundred one million, six hundred sixty-six thousand, seven hundred sixty-one".