621653613563245 has 16 divisors (see below), whose sum is σ = 757146780200448. Its totient is φ = 489881817437760.

The previous prime is 621653613563243. The next prime is 621653613563291. The reversal of 621653613563245 is 542365316356126.

It is not a de Polignac number, because 621653613563245 - 2¹ = 621653613563243 is a prime.

It is a super-2 number, since 2×621653613563245² (a number of 30 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 621653613563245.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (621653613563243) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 25778301 + ... + 43678690.

It is an arithmetic number, because the mean of its divisors is an integer number (47321673762528).

Almost surely, 2^{621653613563245} is an apocalyptic number.

It is an amenable number.

621653613563245 is a deficient number, since it is larger than the sum of its proper divisors (135493166637203).

621653613563245 is a wasteful number, since it uses less digits than its factorization.

621653613563245 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69483780.

The product of its digits is 69984000, while the sum is 58.

The spelling of 621653613563245 in words is "six hundred twenty-one trillion, six hundred fifty-three billion, six hundred thirteen million, five hundred sixty-three thousand, two hundred forty-five".