661401202 has 128 divisors (see below), whose sum is σ = 1373552640. Its totient is φ = 231221760.

The previous prime is 661401199. The next prime is 661401203. The reversal of 661401202 is 202104166.

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 (661401203) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 4827678 + ... + 4827814.

It is an arithmetic number, because the mean of its divisors is an integer number (10730880).

Almost surely, 2^661401202 is an apocalyptic number.

661401202 is an abundant number, since it is smaller than the sum of its proper divisors (712151438).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

661401202 is a wasteful number, since it uses less digits than its factorization.

661401202 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 256.

The product of its (nonzero) digits is 576, while the sum is 22.

The square root of 661401202 is about 25717.7215553789. The cubic root of 661401202 is about 871.2744794611.

Adding to 661401202 its reverse (202104166), we get a palindrome (863505368).

The spelling of 661401202 in words is "six hundred sixty-one million, four hundred one thousand, two hundred two".