621742267705 has 8 divisors (see below), whose sum is σ = 803482315272. Its totient is φ = 459132751488.

The previous prime is 621742267613. The next prime is 621742267709. The reversal of 621742267705 is 507762247126.

It can be written as a sum of positive squares in 4 ways, for example, as 3927403561 + 617814864144 = 62669^2 + 786012^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 621742267705 - 2⁹ = 621742267193 is a prime.

It is not an unprimeable number, because it can be changed into a prime (621742267709) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4782632764 + ... + 4782632893.

It is an arithmetic number, because the mean of its divisors is an integer number (100435289409).

Almost surely, 2^621742267705 is an apocalyptic number.

621742267705 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

It is an amenable number.

621742267705 is a deficient number, since it is larger than the sum of its proper divisors (181740047567).

621742267705 is a wasteful number, since it uses less digits than its factorization.

621742267705 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9565265675.

The product of its (nonzero) digits is 1975680, while the sum is 49.

The spelling of 621742267705 in words is "six hundred twenty-one billion, seven hundred forty-two million, two hundred sixty-seven thousand, seven hundred five".