1663751416625 has 16 divisors (see below), whose sum is σ = 2096520636288. Its totient is φ = 1318078782000.

The previous prime is 1663751416619. The next prime is 1663751416633. The reversal of 1663751416625 is 5266141573661.

It is not a de Polignac number, because 1663751416625 - 2¹² = 1663751412529 is a prime.

It is a Duffinian 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, 64598831 + ... + 64624580.

It is an arithmetic number, because the mean of its divisors is an integer number (131032539768).

Almost surely, 2^{1663751416625} is an apocalyptic number.

It is an amenable number.

1663751416625 is a deficient number, since it is larger than the sum of its proper divisors (432769219663).

1663751416625 is a wasteful number, since it uses less digits than its factorization.

1663751416625 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 129223529 (or 129223519 counting only the distinct ones).

The product of its digits is 5443200, while the sum is 53.

The spelling of 1663751416625 in words is "one trillion, six hundred sixty-three billion, seven hundred fifty-one million, four hundred sixteen thousand, six hundred twenty-five".