1661245004 has 6 divisors (see below), whose sum is σ = 2907178764. Its totient is φ = 830622500.

The previous prime is 1661244997. The next prime is 1661245009. The reversal of 1661245004 is 4005421661.

It is not an unprimeable number, because it can be changed into a prime (1661245009) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 207655622 + ... + 207655629.

It is an arithmetic number, because the mean of its divisors is an integer number (484529794).

Almost surely, 2^1661245004 is an apocalyptic number.

It is an amenable number.

1661245004 is a deficient number, since it is larger than the sum of its proper divisors (1245933760).

1661245004 is a wasteful number, since it uses less digits than its factorization.

1661245004 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 415311255 (or 415311253 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 29.

The square root of 1661245004 is about 40758.3734219117. The cubic root of 1661245004 is about 1184.3440865582.

Adding to 1661245004 its reverse (4005421661), we get a palindrome (5666666665).

It can be divided in two parts, 16612 and 45004, that added together give a palindrome (61616).

The spelling of 1661245004 in words is "one billion, six hundred sixty-one million, two hundred forty-five thousand, four".