1670688961 has 4 divisors (see below), whose sum is σ = 1670807124. Its totient is φ = 1670570800.

The previous prime is 1670688953. The next prime is 1670688977. The reversal of 1670688961 is 1698860761.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1698860761 = 13 ⋅130681597.

It can be written as a sum of positive squares in 2 ways, for example, as 8088336 + 1662600625 = 2844^2 + 40775^2 .

It is a cyclic number.

It is not a de Polignac number, because 1670688961 - 2³ = 1670688953 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1670688899 and 1670688908.

It is not an unprimeable number, because it can be changed into a prime (1670688911) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 34450 + ... + 67291.

It is an arithmetic number, because the mean of its divisors is an integer number (417701781).

Almost surely, 2^1670688961 is an apocalyptic number.

It is an amenable number.

1670688961 is a deficient number, since it is larger than the sum of its proper divisors (118163).

1670688961 is a wasteful number, since it uses less digits than its factorization.

1670688961 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 118162.

The product of its (nonzero) digits is 870912, while the sum is 52.

The square root of 1670688961 is about 40874.0622033093. The cubic root of 1670688961 is about 1186.5841266900.

The spelling of 1670688961 in words is "one billion, six hundred seventy million, six hundred eighty-eight thousand, nine hundred sixty-one".