1667056857 has 8 divisors (see below), whose sum is σ = 2223202080. Its totient is φ = 1111141440.

The previous prime is 1667056847. The next prime is 1667056871. The reversal of 1667056857 is 7586507661.

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

It is not a de Polignac number, because 1667056857 - 2¹⁰ = 1667055833 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1667056847) 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, 39744 + ... + 70097.

It is an arithmetic number, because the mean of its divisors is an integer number (277900260).

Almost surely, 2^1667056857 is an apocalyptic number.

It is an amenable number.

1667056857 is a deficient number, since it is larger than the sum of its proper divisors (556145223).

1667056857 is a wasteful number, since it uses less digits than its factorization.

1667056857 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 114903.

The product of its (nonzero) digits is 2116800, while the sum is 51.

The square root of 1667056857 is about 40829.6076028169. The cubic root of 1667056857 is about 1185.7236186361.

The spelling of 1667056857 in words is "one billion, six hundred sixty-seven million, fifty-six thousand, eight hundred fifty-seven".