1663726352490 has 24 divisors (see below), whose sum is σ = 4325688516708. Its totient is φ = 443660360640.

The previous prime is 1663726352437. The next prime is 1663726352507. The reversal of 1663726352490 is 942536273661.

1663726352490 is a `hidden beast` number, since 1 + 6 + 6 + 3 + 7 + 26 + 3 + 524 + 90 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 1460904925041 + 202821427449 = 1208679^2 + 450357^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 9242924091 + ... + 9242924270.

Almost surely, 2^{1663726352490} is an apocalyptic number.

1663726352490 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1663726352490 is an abundant number, since it is smaller than the sum of its proper divisors (2661962164218).

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

1663726352490 is a wasteful number, since it uses less digits than its factorization.

1663726352490 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18485848374 (or 18485848371 counting only the distinct ones).

The product of its (nonzero) digits is 9797760, while the sum is 54.

It can be divided in two parts, 16637263 and 52490, that added together give a triangular number (16689753 = T₅₇₇₇).

The spelling of 1663726352490 in words is "one trillion, six hundred sixty-three billion, seven hundred twenty-six million, three hundred fifty-two thousand, four hundred ninety".