2643666631620 has 192 divisors, whose sum is σ = 9165676455936. Its totient is φ = 555495413760.

The previous prime is 2643666631601. The next prime is 2643666631621. The reversal of 2643666631620 is 261366663462.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is not an unprimeable number, because it can be changed into a prime (2643666631621) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 3998346 + ... + 4612385.

It is an arithmetic number, because the mean of its divisors is an integer number (47737898208).

Almost surely, 2^{2643666631620} is an apocalyptic number.

2643666631620 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2643666631620 is an abundant number, since it is smaller than the sum of its proper divisors (6522009824316).

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

2643666631620 is a wasteful number, since it uses less digits than its factorization.

2643666631620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8610810 (or 8610808 counting only the distinct ones).

The product of its (nonzero) digits is 6718464, while the sum is 51.

It can be divided in two parts, 264366 and 6631620, that added together give a palindrome (6895986).

The spelling of 2643666631620 in words is "two trillion, six hundred forty-three billion, six hundred sixty-six million, six hundred thirty-one thousand, six hundred twenty".