621772412818 has 8 divisors (see below), whose sum is σ = 973208994048. Its totient is φ = 297369414804.

The previous prime is 621772412747. The next prime is 621772412819. The reversal of 621772412818 is 818214277126.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-3 number, since 3×621772412818³ (a number of 36 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

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 3 ways as a sum of consecutive naturals, for example, 6758395746 + ... + 6758395837.

It is an arithmetic number, because the mean of its divisors is an integer number (121651124256).

Almost surely, 2^621772412818 is an apocalyptic number.

621772412818 is a deficient number, since it is larger than the sum of its proper divisors (351436581230).

621772412818 is a wasteful number, since it uses less digits than its factorization.

621772412818 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13516791608.

The product of its digits is 602112, while the sum is 49.

The spelling of 621772412818 in words is "six hundred twenty-one billion, seven hundred seventy-two million, four hundred twelve thousand, eight hundred eighteen".