661001430 has 32 divisors (see below), whose sum is σ = 1592594784. Its totient is φ = 175579136.

The previous prime is 661001423. The next prime is 661001441. The reversal of 661001430 is 34100166.

661001430 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 661001397 and 661001406.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 35157 + ... + 50576.

It is an arithmetic number, because the mean of its divisors is an integer number (49768587).

Almost surely, 2^661001430 is an apocalyptic number.

661001430 is an abundant number, since it is smaller than the sum of its proper divisors (931593354).

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

661001430 is a wasteful number, since it uses less digits than its factorization.

661001430 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 86000.

The product of its (nonzero) digits is 432, while the sum is 21.

The square root of 661001430 is about 25709.9480746267. The cubic root of 661001430 is about 871.0989020453.

Adding to 661001430 its reverse (34100166), we get a palindrome (695101596).

The spelling of 661001430 in words is "six hundred sixty-one million, one thousand, four hundred thirty".