1631620968720 has 80 divisors (see below), whose sum is σ = 5165642592000. Its totient is φ = 425841498112.

The previous prime is 1631620968631. The next prime is 1631620968727. The reversal of 1631620968720 is 278690261361.

It is a tau number, because it is divible by the number of its divisors (80).

It is not an unprimeable number, because it can be changed into a prime (1631620968727) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 72312345 + ... + 72334904.

It is an arithmetic number, because the mean of its divisors is an integer number (64570532400).

Almost surely, 2^{1631620968720} is an apocalyptic number.

1631620968720 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1631620968720 is an abundant number, since it is smaller than the sum of its proper divisors (3534021623280).

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

1631620968720 is a wasteful number, since it uses less digits than its factorization.

1631620968720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 144647312 (or 144647306 counting only the distinct ones).

The product of its (nonzero) digits is 1306368, while the sum is 51.

It can be divided in two parts, 1631620 and 968720, that added together give a triangular number (2600340 = T₂₂₈₀).

The spelling of 1631620968720 in words is "one trillion, six hundred thirty-one billion, six hundred twenty million, nine hundred sixty-eight thousand, seven hundred twenty".