1621318325759 has 8 divisors (see below), whose sum is σ = 1861800948480. Its totient is φ = 1396350711000.

The previous prime is 1621318325729. The next prime is 1621318325831. The reversal of 1621318325759 is 9575238131261.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1621318325759 is a prime.

It is a super-2 number, since 2×1621318325759² (a number of 25 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1621318325759.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1621318325729) 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, 3878751767 + ... + 3878752184.

It is an arithmetic number, because the mean of its divisors is an integer number (232725118560).

Almost surely, 2^{1621318325759} is an apocalyptic number.

1621318325759 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

1621318325759 is a deficient number, since it is larger than the sum of its proper divisors (240482622721).

1621318325759 is a wasteful number, since it uses less digits than its factorization.

1621318325759 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7757503981.

The product of its digits is 2721600, while the sum is 53.

The spelling of 1621318325759 in words is "one trillion, six hundred twenty-one billion, three hundred eighteen million, three hundred twenty-five thousand, seven hundred fifty-nine".