461643660140465 has 24 divisors (see below), whose sum is σ = 640959792607680. Its totient is φ = 318070273007520.

The previous prime is 461643660140461. The next prime is 461643660140473. The reversal of 461643660140465 is 564041066346164.

It is a happy number.

It is not a de Polignac number, because 461643660140465 - 2² = 461643660140461 is a prime.

It is a super-2 number, since 2×461643660140465² (a number of 30 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (56) coincides with the sum of the digits of its prime factors.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 461643660140465.

It is not an unprimeable number, because it can be changed into a prime (461643660140461) 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, 20080182509 + ... + 20080205498.

It is an arithmetic number, because the mean of its divisors is an integer number (26706658025320).

Almost surely, 2^{461643660140465} is an apocalyptic number.

It is an amenable number.

461643660140465 is a deficient number, since it is larger than the sum of its proper divisors (179316132467215).

461643660140465 is a wasteful number, since it uses less digits than its factorization.

461643660140465 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40160388053 (or 40160388042 counting only the distinct ones).

The product of its (nonzero) digits is 29859840, while the sum is 56.

The spelling of 461643660140465 in words is "four hundred sixty-one trillion, six hundred forty-three billion, six hundred sixty million, one hundred forty thousand, four hundred sixty-five".