1620649043538 has 32 divisors (see below), whose sum is σ = 3710344523904. Its totient is φ = 462292102272.

The previous prime is 1620649043513. The next prime is 1620649043551. The reversal of 1620649043538 is 8353409460261.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 31243845 + ... + 31295672.

It is an arithmetic number, because the mean of its divisors is an integer number (115948266372).

Almost surely, 2^{1620649043538} is an apocalyptic number.

1620649043538 is an abundant number, since it is smaller than the sum of its proper divisors (2089695480366).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1620649043538 is a wasteful number, since it uses less digits than its factorization.

1620649043538 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 62540146.

The product of its (nonzero) digits is 3732480, while the sum is 51.

The spelling of 1620649043538 in words is "one trillion, six hundred twenty billion, six hundred forty-nine million, forty-three thousand, five hundred thirty-eight".