661395498 has 32 divisors (see below), whose sum is σ = 1417620096. Its totient is φ = 205178688.

The previous prime is 661395467. The next prime is 661395503. The reversal of 661395498 is 894593166.

It is a self number, because there is not a number n which added to its sum of digits gives 661395498.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 59661 + ... + 69872.

It is an arithmetic number, because the mean of its divisors is an integer number (44300628).

Almost surely, 2^661395498 is an apocalyptic number.

661395498 is an abundant number, since it is smaller than the sum of its proper divisors (756224598).

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

661395498 is a wasteful number, since it uses less digits than its factorization.

661395498 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 129598.

The product of its digits is 1399680, while the sum is 51.

The square root of 661395498 is about 25717.6106588462. The cubic root of 661395498 is about 871.2719747968.

The spelling of 661395498 in words is "six hundred sixty-one million, three hundred ninety-five thousand, four hundred ninety-eight".