1661301004 has 24 divisors (see below), whose sum is σ = 3215027088. Its totient is φ = 744791040.

The previous prime is 1661300987. The next prime is 1661301007. The reversal of 1661301004 is 4001031661.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is not an unprimeable number, because it can be changed into a prime (1661301007) 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, 255397 + ... + 261820.

It is an arithmetic number, because the mean of its divisors is an integer number (133959462).

Almost surely, 2^1661301004 is an apocalyptic number.

It is an amenable number.

1661301004 is a deficient number, since it is larger than the sum of its proper divisors (1553726084).

1661301004 is a wasteful number, since it uses less digits than its factorization.

1661301004 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 517305 (or 517303 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 22.

The square root of 1661301004 is about 40759.0603915252. The cubic root of 1661301004 is about 1184.3573943531.

Adding to 1661301004 its reverse (4001031661), we get a palindrome (5662332665).

The spelling of 1661301004 in words is "one billion, six hundred sixty-one million, three hundred one thousand, four".