661254938 has 8 divisors (see below), whose sum is σ = 1012986432. Its totient is φ = 323592796.

The previous prime is 661254901. The next prime is 661254961. The reversal of 661254938 is 839452166.

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3517220 + ... + 3517407.

It is an arithmetic number, because the mean of its divisors is an integer number (126623304).

Almost surely, 2^661254938 is an apocalyptic number.

661254938 is a deficient number, since it is larger than the sum of its proper divisors (351731494).

661254938 is a wasteful number, since it uses less digits than its factorization.

661254938 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7034676.

The product of its digits is 311040, while the sum is 44.

The square root of 661254938 is about 25714.8777558829. The cubic root of 661254938 is about 871.2102494168.

The spelling of 661254938 in words is "six hundred sixty-one million, two hundred fifty-four thousand, nine hundred thirty-eight".