621455324451 has 32 divisors (see below), whose sum is σ = 894169399872. Its totient is φ = 381653475840.

The previous prime is 621455324429. The next prime is 621455324459. The reversal of 621455324451 is 154423554126.

621455324451 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 621455324451 - 2¹¹ = 621455322403 is a prime.

It is not an unprimeable number, because it can be changed into a prime (621455324459) 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, 40104261 + ... + 40119753.

It is an arithmetic number, because the mean of its divisors is an integer number (27942793746).

Almost surely, 2^621455324451 is an apocalyptic number.

621455324451 is a deficient number, since it is larger than the sum of its proper divisors (272714075421).

621455324451 is a wasteful number, since it uses less digits than its factorization.

621455324451 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17543.

The product of its digits is 576000, while the sum is 42.

Adding to 621455324451 its reverse (154423554126), we get a palindrome (775878878577).

The spelling of 621455324451 in words is "six hundred twenty-one billion, four hundred fifty-five million, three hundred twenty-four thousand, four hundred fifty-one".