621640266431152 has 20 divisors (see below), whose sum is σ = 1204435317221640. Its totient is φ = 310818249083648.

The previous prime is 621640266431143. The next prime is 621640266431189. The reversal of 621640266431152 is 251134662046126.

It is a super-4 number, since 4×621640266431152⁴ (a number of 60 digits) contains 4444 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 621640266431096 and 621640266431105.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 115034377 + ... + 120317032.

It is an arithmetic number, because the mean of its divisors is an integer number (60221765861082).

Almost surely, 2^{621640266431152} is an apocalyptic number.

It is an amenable number.

621640266431152 is a deficient number, since it is larger than the sum of its proper divisors (582795050790488).

621640266431152 is a wasteful number, since it uses less digits than its factorization.

621640266431152 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 235516500 (or 235516494 counting only the distinct ones).

The product of its (nonzero) digits is 2488320, while the sum is 49.

The spelling of 621640266431152 in words is "six hundred twenty-one trillion, six hundred forty billion, two hundred sixty-six million, four hundred thirty-one thousand, one hundred fifty-two".