63661507540 has 48 divisors (see below), whose sum is σ = 140862798720. Its totient is φ = 24100813440.

The previous prime is 63661507519. The next prime is 63661507561. The reversal of 63661507540 is 4570516636.

It is an interprime number because it is at equal distance from previous prime (63661507519) and next prime (63661507561).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 310534 + ... + 473026.

It is an arithmetic number, because the mean of its divisors is an integer number (2934641640).

Almost surely, 2^63661507540 is an apocalyptic number.

It is an amenable number.

63661507540 is an abundant number, since it is smaller than the sum of its proper divisors (77201291180).

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

63661507540 is a wasteful number, since it uses less digits than its factorization.

63661507540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 163552 (or 163550 counting only the distinct ones).

The product of its (nonzero) digits is 453600, while the sum is 43.

The spelling of 63661507540 in words is "sixty-three billion, six hundred sixty-one million, five hundred seven thousand, five hundred forty".