621772412811 has 24 divisors (see below), whose sum is σ = 906020719296. Its totient is φ = 376156109040.

The previous prime is 621772412747. The next prime is 621772412819. The reversal of 621772412811 is 118214277126.

It is a happy number.

It is not a de Polignac number, because 621772412811 - 2⁶ = 621772412747 is a prime.

It is a super-3 number, since 3×621772412811³ (a number of 36 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (621772412819) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 10430256 + ... + 10489698.

It is an arithmetic number, because the mean of its divisors is an integer number (37750863304).

Almost surely, 2^621772412811 is an apocalyptic number.

621772412811 is a deficient number, since it is larger than the sum of its proper divisors (284248306485).

621772412811 is an equidigital number, since it uses as much as digits as its factorization.

621772412811 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60583 (or 60020 counting only the distinct ones).

The product of its digits is 75264, while the sum is 42.

Adding to 621772412811 its reverse (118214277126), we get a palindrome (739986689937).

The spelling of 621772412811 in words is "six hundred twenty-one billion, seven hundred seventy-two million, four hundred twelve thousand, eight hundred eleven".