661466402 has 4 divisors (see below), whose sum is σ = 992199606. Its totient is φ = 330733200.

The previous prime is 661466401. The next prime is 661466431. The reversal of 661466402 is 204664166.

661466402 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It can be written as a sum of positive squares in only one way, i.e., 661055521 + 410881 = 25711^2 + 641^2 .

It is not an unprimeable number, because it can be changed into a prime (661466401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 165366599 + ... + 165366602.

Almost surely, 2^661466402 is an apocalyptic number.

661466402 is a deficient number, since it is larger than the sum of its proper divisors (330733204).

661466402 is a wasteful number, since it uses less digits than its factorization.

661466402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 330733203.

The product of its (nonzero) digits is 41472, while the sum is 35.

The square root of 661466402 is about 25718.9891325456. The cubic root of 661466402 is about 871.3031081912.

The spelling of 661466402 in words is "six hundred sixty-one million, four hundred sixty-six thousand, four hundred two".