663955540542 has 80 divisors (see below), whose sum is σ = 1729106881920. Its totient is φ = 186486283152.

The previous prime is 663955540513. The next prime is 663955540579. The reversal of 663955540542 is 245045559366.

663955540542 is a `hidden beast` number, since 6 + 6 + 3 + 9 + 5 + 55 + 40 + 542 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 4894948 + ... + 5028759.

It is an arithmetic number, because the mean of its divisors is an integer number (21613836024).

Almost surely, 2^663955540542 is an apocalyptic number.

663955540542 is an abundant number, since it is smaller than the sum of its proper divisors (1065151341378).

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

663955540542 is a wasteful number, since it uses less digits than its factorization.

663955540542 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9923787 (or 9923778 counting only the distinct ones).

The product of its (nonzero) digits is 19440000, while the sum is 54.

The spelling of 663955540542 in words is "six hundred sixty-three billion, nine hundred fifty-five million, five hundred forty thousand, five hundred forty-two".