1621662153602 has 8 divisors (see below), whose sum is σ = 2446553885436. Its totient is φ = 806144191792.

The previous prime is 1621662153593. The next prime is 1621662153637. The reversal of 1621662153602 is 2063512661261.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 1482138239761 + 139523913841 = 1217431^2 + 373529^2 .

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

It is a self number, because there is not a number n which added to its sum of digits gives 1621662153602.

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, 2343442073 + ... + 2343442764.

Almost surely, 2^{1621662153602} is an apocalyptic number.

1621662153602 is a deficient number, since it is larger than the sum of its proper divisors (824891731834).

1621662153602 is a wasteful number, since it uses less digits than its factorization.

1621662153602 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4686885012.

The product of its (nonzero) digits is 155520, while the sum is 41.

The spelling of 1621662153602 in words is "one trillion, six hundred twenty-one billion, six hundred sixty-two million, one hundred fifty-three thousand, six hundred two".