1670277661 has 8 divisors (see below), whose sum is σ = 1828249304. Its totient is φ = 1516518720.

The previous prime is 1670277617. The next prime is 1670277673. The reversal of 1670277661 is 1667720761.

It can be written as a sum of positive squares in 4 ways, for example, as 2500 + 1670275161 = 50^2 + 40869^2 .

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 1670277661 - 2¹⁵ = 1670244893 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1670277611) 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, 1052346 + ... + 1053931.

It is an arithmetic number, because the mean of its divisors is an integer number (228531163).

Almost surely, 2^1670277661 is an apocalyptic number.

It is an amenable number.

1670277661 is a deficient number, since it is larger than the sum of its proper divisors (157971643).

1670277661 is a wasteful number, since it uses less digits than its factorization.

1670277661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2106351.

The product of its (nonzero) digits is 148176, while the sum is 43.

The square root of 1670277661 is about 40869.0305855179. The cubic root of 1670277661 is about 1186.4867452867.

The spelling of 1670277661 in words is "one billion, six hundred seventy million, two hundred seventy-seven thousand, six hundred sixty-one".