1621652565131 has 8 divisors (see below), whose sum is σ = 1629099346560. Its totient is φ = 1614207344832.

The previous prime is 1621652565089. The next prime is 1621652565151. The reversal of 1621652565131 is 1315652561261.

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-1621652565131 is a prime.

It is a super-2 number, since 2×1621652565131² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1621652565151) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1718105 + ... + 2489013.

It is an arithmetic number, because the mean of its divisors is an integer number (203637418320).

Almost surely, 2^{1621652565131} is an apocalyptic number.

1621652565131 is a deficient number, since it is larger than the sum of its proper divisors (7446781429).

1621652565131 is an equidigital number, since it uses as much as digits as its factorization.

1621652565131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 780565.

The product of its digits is 324000, while the sum is 44.

The spelling of 1621652565131 in words is "one trillion, six hundred twenty-one billion, six hundred fifty-two million, five hundred sixty-five thousand, one hundred thirty-one".