621353513016061 has 4 divisors (see below), whose sum is σ = 710118300589792. Its totient is φ = 532588725442332.

The previous prime is 621353513016023. The next prime is 621353513016077. The reversal of 621353513016061 is 160610315353126.

It is a happy number.

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 621353513016061 - 2¹³ = 621353513007869 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 621353513015999 and 621353513016017.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (621353513026061) 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, 44382393786855 + ... + 44382393786868.

It is an arithmetic number, because the mean of its divisors is an integer number (177529575147448).

Almost surely, 2^{621353513016061} is an apocalyptic number.

It is an amenable number.

621353513016061 is a deficient number, since it is larger than the sum of its proper divisors (88764787573731).

621353513016061 is an equidigital number, since it uses as much as digits as its factorization.

621353513016061 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 88764787573730.

The product of its (nonzero) digits is 291600, while the sum is 43.

Adding to 621353513016061 its reverse (160610315353126), we get a palindrome (781963828369187).

The spelling of 621353513016061 in words is "six hundred twenty-one trillion, three hundred fifty-three billion, five hundred thirteen million, sixteen thousand, sixty-one".