1651821857016 has 32 divisors (see below), whose sum is σ = 4230275490000. Its totient is φ = 537177839360.

The previous prime is 1651821857011. The next prime is 1651821857017. The reversal of 1651821857016 is 6107581281561.

It is a self number, because there is not a number n which added to its sum of digits gives 1651821857016.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1651821857011) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 839339391 + ... + 839341358.

Almost surely, 2^{1651821857016} is an apocalyptic number.

It is an amenable number.

1651821857016 is an abundant number, since it is smaller than the sum of its proper divisors (2578453632984).

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

1651821857016 is a wasteful number, since it uses less digits than its factorization.

1651821857016 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1678680799 (or 1678680795 counting only the distinct ones).

The product of its (nonzero) digits is 806400, while the sum is 51.

The spelling of 1651821857016 in words is "one trillion, six hundred fifty-one billion, eight hundred twenty-one million, eight hundred fifty-seven thousand, sixteen".