661374001 has 8 divisors (see below), whose sum is σ = 719205480. Its totient is φ = 605645568.

The previous prime is 661373987. The next prime is 661374037. The reversal of 661374001 is 100473166.

661374001 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 345067776 + 316306225 = 18576^2 + 17785^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 661374001 - 2¹⁷ = 661242929 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (661374071) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 525106 + ... + 526363.

It is an arithmetic number, because the mean of its divisors is an integer number (89900685).

Almost surely, 2^661374001 is an apocalyptic number.

It is an amenable number.

661374001 is a deficient number, since it is larger than the sum of its proper divisors (57831479).

661374001 is a wasteful number, since it uses less digits than its factorization.

661374001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1051523.

The product of its (nonzero) digits is 3024, while the sum is 28.

The square root of 661374001 is about 25717.1927122694. The cubic root of 661374001 is about 871.2625351919.

The spelling of 661374001 in words is "six hundred sixty-one million, three hundred seventy-four thousand, one".