1663379642925 has 432 divisors, whose sum is σ = 4080333216960. Its totient is φ = 636733440000.

The previous prime is 1663379642891. The next prime is 1663379642929. The reversal of 1663379642925 is 5292469733661.

1663379642925 is a `hidden beast` number, since 1 + 6 + 6 + 337 + 9 + 6 + 4 + 292 + 5 = 666.

It is not a de Polignac number, because 1663379642925 - 2⁶ = 1663379642861 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1663379642929) by changing a digit.

It is a polite number, since it can be written in 431 ways as a sum of consecutive naturals, for example, 1038962125 + ... + 1038963725.

It is an arithmetic number, because the mean of its divisors is an integer number (9445215780).

Almost surely, 2^{1663379642925} is an apocalyptic number.

1663379642925 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1663379642925 is an abundant number, since it is smaller than the sum of its proper divisors (2416953574035).

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

1663379642925 is a wasteful number, since it uses less digits than its factorization.

1663379642925 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2314 (or 2299 counting only the distinct ones).

The product of its digits is 88179840, while the sum is 63.

The spelling of 1663379642925 in words is "one trillion, six hundred sixty-three billion, three hundred seventy-nine million, six hundred forty-two thousand, nine hundred twenty-five".