661429378 has 8 divisors (see below), whose sum is σ = 992517120. Its totient is φ = 330590340.

The previous prime is 661429367. The next prime is 661429451. The reversal of 661429378 is 873924166.

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 55378 + ... + 66253.

It is an arithmetic number, because the mean of its divisors is an integer number (124064640).

Almost surely, 2^661429378 is an apocalyptic number.

661429378 is a deficient number, since it is larger than the sum of its proper divisors (331087742).

661429378 is a wasteful number, since it uses less digits than its factorization.

661429378 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 124352.

The product of its digits is 435456, while the sum is 46.

The square root of 661429378 is about 25718.2693430176. The cubic root of 661429378 is about 871.2868515186.

The spelling of 661429378 in words is "six hundred sixty-one million, four hundred twenty-nine thousand, three hundred seventy-eight".