1620908694889 has 4 divisors (see below), whose sum is σ = 1768264030800. Its totient is φ = 1473553358980.

The previous prime is 1620908694883. The next prime is 1620908694931. The reversal of 1620908694889 is 9884968090261.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1620908694889 - 2¹¹ = 1620908692841 is a prime.

It is a super-2 number, since 2×1620908694889² (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 (1620908694883) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 73677667939 + ... + 73677667960.

It is an arithmetic number, because the mean of its divisors is an integer number (442066007700).

Almost surely, 2^{1620908694889} is an apocalyptic number.

It is an amenable number.

1620908694889 is a deficient number, since it is larger than the sum of its proper divisors (147355335911).

1620908694889 is a wasteful number, since it uses less digits than its factorization.

1620908694889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 147355335910.

The product of its (nonzero) digits is 107495424, while the sum is 70.

The spelling of 1620908694889 in words is "one trillion, six hundred twenty billion, nine hundred eight million, six hundred ninety-four thousand, eight hundred eighty-nine".