661019435 has 8 divisors (see below), whose sum is σ = 811670640. Its totient is φ = 516517344.

The previous prime is 661019431. The next prime is 661019441. The reversal of 661019435 is 534910166.

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 661019435 - 2² = 661019431 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 661019395 and 661019404.

It is not an unprimeable number, because it can be changed into a prime (661019431) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 1537040 + ... + 1537469.

It is an arithmetic number, because the mean of its divisors is an integer number (101458830).

Almost surely, 2^661019435 is an apocalyptic number.

661019435 is a deficient number, since it is larger than the sum of its proper divisors (150651205).

661019435 is a wasteful number, since it uses less digits than its factorization.

661019435 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3074557.

The product of its (nonzero) digits is 19440, while the sum is 35.

The square root of 661019435 is about 25710.2982285309. The cubic root of 661019435 is about 871.1068112533.

The spelling of 661019435 in words is "six hundred sixty-one million, nineteen thousand, four hundred thirty-five".