1420663655621 has 32 divisors (see below), whose sum is σ = 1741221888000. Its totient is φ = 1156387201200.

The previous prime is 1420663655563. The next prime is 1420663655633. The reversal of 1420663655621 is 1265563660241.

It is not a de Polignac number, because 1420663655621 - 2⁶ = 1420663655557 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1420663651621) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 448796 + ... + 1744346.

It is an arithmetic number, because the mean of its divisors is an integer number (54413184000).

Almost surely, 2^{1420663655621} is an apocalyptic number.

It is an amenable number.

1420663655621 is a deficient number, since it is larger than the sum of its proper divisors (320558232379).

1420663655621 is a wasteful number, since it uses less digits than its factorization.

1420663655621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1295734 (or 1295720 counting only the distinct ones).

The product of its (nonzero) digits is 1555200, while the sum is 47.

The spelling of 1420663655621 in words is "one trillion, four hundred twenty billion, six hundred sixty-three million, six hundred fifty-five thousand, six hundred twenty-one".