661047056997 has 8 divisors (see below), whose sum is σ = 887737055520. Its totient is φ = 437527548240.

The previous prime is 661047056963. The next prime is 661047057019. The reversal of 661047056997 is 799650740166.

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

It is not a de Polignac number, because 661047056997 - 2⁶ = 661047056933 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 661047056997.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (661047056927) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 792621954 + ... + 792622787.

It is an arithmetic number, because the mean of its divisors is an integer number (110967131940).

Almost surely, 2^661047056997 is an apocalyptic number.

It is an amenable number.

661047056997 is a deficient number, since it is larger than the sum of its proper divisors (226689998523).

661047056997 is a wasteful number, since it uses less digits than its factorization.

661047056997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1585244883.

The product of its (nonzero) digits is 17146080, while the sum is 60.

The spelling of 661047056997 in words is "six hundred sixty-one billion, forty-seven million, fifty-six thousand, nine hundred ninety-seven".