1660047401 has 4 divisors (see below), whose sum is σ = 1700536404. Its totient is φ = 1619558400.

The previous prime is 1660047391. The next prime is 1660047407. The reversal of 1660047401 is 1047400661.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 504047401 + 1156000000 = 22451^2 + 34000^2 .

It is a cyclic number.

It is not a de Polignac number, because 1660047401 - 2²⁶ = 1592938537 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1660047407) 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, 20244440 + ... + 20244521.

It is an arithmetic number, because the mean of its divisors is an integer number (425134101).

Almost surely, 2^1660047401 is an apocalyptic number.

It is an amenable number.

1660047401 is a deficient number, since it is larger than the sum of its proper divisors (40489003).

1660047401 is an equidigital number, since it uses as much as digits as its factorization.

1660047401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40489002.

The product of its (nonzero) digits is 4032, while the sum is 29.

The square root of 1660047401 is about 40743.6792766682. The cubic root of 1660047401 is about 1184.0594175293.

The spelling of 1660047401 in words is "one billion, six hundred sixty million, forty-seven thousand, four hundred one".