1463644721020 has 12 divisors (see below), whose sum is σ = 3073653914184. Its totient is φ = 585457888400.

The previous prime is 1463644721003. The next prime is 1463644721027. The reversal of 1463644721020 is 201274463641.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1463644721027) 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, 36591118006 + ... + 36591118045.

It is an arithmetic number, because the mean of its divisors is an integer number (256137826182).

Almost surely, 2^{1463644721020} is an apocalyptic number.

1463644721020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1463644721020 is an abundant number, since it is smaller than the sum of its proper divisors (1610009193164).

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

1463644721020 is a wasteful number, since it uses less digits than its factorization.

1463644721020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73182236060 (or 73182236058 counting only the distinct ones).

The product of its (nonzero) digits is 193536, while the sum is 40.

The spelling of 1463644721020 in words is "one trillion, four hundred sixty-three billion, six hundred forty-four million, seven hundred twenty-one thousand, twenty".