1621133045765 has 8 divisors (see below), whose sum is σ = 1945469155968. Its totient is φ = 1296833435920.

The previous prime is 1621133045759. The next prime is 1621133045767. The reversal of 1621133045765 is 5675403311261.

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

It is not a de Polignac number, because 1621133045765 - 2³⁸ = 1346255138821 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1621133045767) 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, 9027281 + ... + 9205110.

It is an arithmetic number, because the mean of its divisors is an integer number (243183644496).

Almost surely, 2^{1621133045765} is an apocalyptic number.

It is an amenable number.

1621133045765 is a deficient number, since it is larger than the sum of its proper divisors (324336110203).

1621133045765 is a wasteful number, since it uses less digits than its factorization.

1621133045765 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18250179.

The product of its (nonzero) digits is 453600, while the sum is 44.

The spelling of 1621133045765 in words is "one trillion, six hundred twenty-one billion, one hundred thirty-three million, forty-five thousand, seven hundred sixty-five".