1646312740061 has 4 divisors (see below), whose sum is σ = 1795977534624. Its totient is φ = 1496647945500.

The previous prime is 1646312740057. The next prime is 1646312740091. The reversal of 1646312740061 is 1600472136461.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1646312740061 - 2² = 1646312740057 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1646312740001) 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, 74832397265 + ... + 74832397286.

It is an arithmetic number, because the mean of its divisors is an integer number (448994383656).

Almost surely, 2^{1646312740061} is an apocalyptic number.

1646312740061 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1646312740061 is a deficient number, since it is larger than the sum of its proper divisors (149664794563).

1646312740061 is a wasteful number, since it uses less digits than its factorization.

1646312740061 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 149664794562.

The product of its (nonzero) digits is 145152, while the sum is 41.

The spelling of 1646312740061 in words is "one trillion, six hundred forty-six billion, three hundred twelve million, seven hundred forty thousand, sixty-one".