661067755042 has 8 divisors (see below), whose sum is σ = 991919361132. Its totient is φ = 330427968000.

The previous prime is 661067754979. The next prime is 661067755043. The reversal of 661067755042 is 240557760166.

It can be written as a sum of positive squares in 2 ways, for example, as 601429719361 + 59638035681 = 775519^2 + 244209^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (661067755043) 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, 52946959 + ... + 52959442.

Almost surely, 2^661067755042 is an apocalyptic number.

661067755042 is a deficient number, since it is larger than the sum of its proper divisors (330851606090).

661067755042 is a wasteful number, since it uses less digits than its factorization.

661067755042 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 105909524.

The product of its (nonzero) digits is 2116800, while the sum is 49.

The spelling of 661067755042 in words is "six hundred sixty-one billion, sixty-seven million, seven hundred fifty-five thousand, forty-two".