1655018678640 has 320 divisors, whose sum is σ = 5625710931456. Its totient is φ = 400825614336.

The previous prime is 1655018678611. The next prime is 1655018678701. The reversal of 1655018678640 is 468768105561.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 14504692 + ... + 14618348.

Almost surely, 2^{1655018678640} is an apocalyptic number.

1655018678640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1655018678640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2812855465728).

1655018678640 is an abundant number, since it is smaller than the sum of its proper divisors (3970692252816).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1655018678640 is a wasteful number, since it uses less digits than its factorization.

1655018678640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 113816 (or 113810 counting only the distinct ones).

The product of its (nonzero) digits is 9676800, while the sum is 57.

The spelling of 1655018678640 in words is "one trillion, six hundred fifty-five billion, eighteen million, six hundred seventy-eight thousand, six hundred forty".