1640407654655 has 96 divisors (see below), whose sum is σ = 2593138665600. Its totient is φ = 973799608320.

The previous prime is 1640407654651. The next prime is 1640407654681. The reversal of 1640407654655 is 5564567040461.

It is a Cunningham number, because it is equal to 1280784²-1.

It is not a de Polignac number, because 1640407654655 - 2² = 1640407654651 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1640407654597 and 1640407654606.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1640407654651) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 8874011 + ... + 9056979.

It is an arithmetic number, because the mean of its divisors is an integer number (27011861100).

Almost surely, 2^{1640407654655} is an apocalyptic number.

1640407654655 is a deficient number, since it is larger than the sum of its proper divisors (952731010945).

1640407654655 is a wasteful number, since it uses less digits than its factorization.

1640407654655 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 183105 (or 183094 counting only the distinct ones).

The product of its (nonzero) digits is 12096000, while the sum is 53.

The spelling of 1640407654655 in words is "one trillion, six hundred forty billion, four hundred seven million, six hundred fifty-four thousand, six hundred fifty-five".