1620058720621 has 4 divisors (see below), whose sum is σ = 1767336786144. Its totient is φ = 1472780655100.

The previous prime is 1620058720591. The next prime is 1620058720699. The reversal of 1620058720621 is 1260278500261.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1620058720621 - 2⁹ = 1620058720109 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1620058720321) 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, 73639032745 + ... + 73639032766.

It is an arithmetic number, because the mean of its divisors is an integer number (441834196536).

Almost surely, 2^{1620058720621} is an apocalyptic number.

1620058720621 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1620058720621 is a deficient number, since it is larger than the sum of its proper divisors (147278065523).

1620058720621 is a wasteful number, since it uses less digits than its factorization.

1620058720621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 147278065522.

The product of its (nonzero) digits is 80640, while the sum is 40.

The spelling of 1620058720621 in words is "one trillion, six hundred twenty billion, fifty-eight million, seven hundred twenty thousand, six hundred twenty-one".