1620651615242 has 24 divisors (see below), whose sum is σ = 2673767589696. Its totient is φ = 736190741000.

The previous prime is 1620651615199. The next prime is 1620651615251. The reversal of 1620651615242 is 2425161560261.

It is a self number, because there is not a number n which added to its sum of digits gives 1620651615242.

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 1751234 + ... + 2511597.

It is an arithmetic number, because the mean of its divisors is an integer number (111406982904).

Almost surely, 2^{1620651615242} is an apocalyptic number.

1620651615242 is a deficient number, since it is larger than the sum of its proper divisors (1053115974454).

1620651615242 is a wasteful number, since it uses less digits than its factorization.

1620651615242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4264426 (or 4264415 counting only the distinct ones).

The product of its (nonzero) digits is 172800, while the sum is 41.

The spelling of 1620651615242 in words is "one trillion, six hundred twenty billion, six hundred fifty-one million, six hundred fifteen thousand, two hundred forty-two".