1663991361510 has 64 divisors (see below), whose sum is σ = 4094969065920. Its totient is φ = 432594247680.

The previous prime is 1663991361499. The next prime is 1663991361541. The reversal of 1663991361510 is 151631993661.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3816595 + ... + 4230174.

It is an arithmetic number, because the mean of its divisors is an integer number (63983891655).

Almost surely, 2^{1663991361510} is an apocalyptic number.

1663991361510 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1663991361510 is an abundant number, since it is smaller than the sum of its proper divisors (2430977704410).

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

1663991361510 is a wasteful number, since it uses less digits than its factorization.

1663991361510 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8046953.

The product of its (nonzero) digits is 787320, while the sum is 51.

The spelling of 1663991361510 in words is "one trillion, six hundred sixty-three billion, nine hundred ninety-one million, three hundred sixty-one thousand, five hundred ten".