1620521461394 has 8 divisors (see below), whose sum is σ = 2651762391408. Its totient is φ = 736600664260.

The previous prime is 1620521461369. The next prime is 1620521461411. The reversal of 1620521461394 is 4931641250261.

It is a happy number.

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 36830033192 + ... + 36830033235.

It is an arithmetic number, because the mean of its divisors is an integer number (331470298926).

Almost surely, 2^{1620521461394} is an apocalyptic number.

1620521461394 is a deficient number, since it is larger than the sum of its proper divisors (1031240930014).

1620521461394 is a wasteful number, since it uses less digits than its factorization.

1620521461394 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 73660066440.

The product of its (nonzero) digits is 311040, while the sum is 44.

The spelling of 1620521461394 in words is "one trillion, six hundred twenty billion, five hundred twenty-one million, four hundred sixty-one thousand, three hundred ninety-four".