1661011707 has 8 divisors (see below), whose sum is σ = 2344957776. Its totient is φ = 1042203392.

The previous prime is 1661011691. The next prime is 1661011727. The reversal of 1661011707 is 7071101661.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1661011707 - 2⁴ = 1661011691 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1661011727) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16284378 + ... + 16284479.

It is an arithmetic number, because the mean of its divisors is an integer number (293119722).

Almost surely, 2^1661011707 is an apocalyptic number.

1661011707 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

1661011707 is a deficient number, since it is larger than the sum of its proper divisors (683946069).

1661011707 is a wasteful number, since it uses less digits than its factorization.

1661011707 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32568877.

The product of its (nonzero) digits is 1764, while the sum is 30.

The square root of 1661011707 is about 40755.5113696295. The cubic root of 1661011707 is about 1184.2886428283.

The spelling of 1661011707 in words is "one billion, six hundred sixty-one million, eleven thousand, seven hundred seven".