661427498 has 32 divisors (see below), whose sum is σ = 1036808640. Its totient is φ = 316218240.

The previous prime is 661427497. The next prime is 661427561. The reversal of 661427498 is 894724166.

661427498 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×661427498² = 874972670221080008, which contains 22 as substring.

It is a Smith number, since the sum of its digits (47) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (661427497) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1068233 + ... + 1068851.

It is an arithmetic number, because the mean of its divisors is an integer number (32400270).

Almost surely, 2^661427498 is an apocalyptic number.

661427498 is a deficient number, since it is larger than the sum of its proper divisors (375381142).

661427498 is a wasteful number, since it uses less digits than its factorization.

661427498 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 902.

The product of its digits is 580608, while the sum is 47.

The square root of 661427498 is about 25718.2327930984. The cubic root of 661427498 is about 871.2860260232.

The spelling of 661427498 in words is "six hundred sixty-one million, four hundred twenty-seven thousand, four hundred ninety-eight".