661300429 has 4 divisors (see below), whose sum is σ = 667848060. Its totient is φ = 654752800.

The previous prime is 661300421. The next prime is 661300441. The reversal of 661300429 is 924003166.

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

It can be written as a sum of positive squares in 2 ways, for example, as 637310025 + 23990404 = 25245^2 + 4898^2 .

It is a cyclic number.

It is not a de Polignac number, because 661300429 - 2³ = 661300421 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 661300429.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (661300421) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3273664 + ... + 3273865.

It is an arithmetic number, because the mean of its divisors is an integer number (166962015).

Almost surely, 2^661300429 is an apocalyptic number.

It is an amenable number.

661300429 is a deficient number, since it is larger than the sum of its proper divisors (6547631).

661300429 is a wasteful number, since it uses less digits than its factorization.

661300429 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6547630.

The product of its (nonzero) digits is 7776, while the sum is 31.

The square root of 661300429 is about 25715.7622675277. The cubic root of 661300429 is about 871.2302272471.

The spelling of 661300429 in words is "six hundred sixty-one million, three hundred thousand, four hundred twenty-nine".