661006246461 has 24 divisors (see below), whose sum is σ = 975163073472. Its totient is φ = 397956768000.

The previous prime is 661006246451. The next prime is 661006246469. The reversal of 661006246461 is 164642600166.

It is not a de Polignac number, because 661006246461 - 2¹⁹ = 661005722173 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (661006246469) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 5974836 + ... + 6084461.

It is an arithmetic number, because the mean of its divisors is an integer number (40631794728).

Almost surely, 2^661006246461 is an apocalyptic number.

It is an amenable number.

661006246461 is a deficient number, since it is larger than the sum of its proper divisors (314156827011).

661006246461 is a wasteful number, since it uses less digits than its factorization.

661006246461 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12059473 (or 12059462 counting only the distinct ones).

The product of its (nonzero) digits is 248832, while the sum is 42.

The spelling of 661006246461 in words is "six hundred sixty-one billion, six million, two hundred forty-six thousand, four hundred sixty-one".