661163839637 has 8 divisors (see below), whose sum is σ = 795385070400. Its totient is φ = 536884922304.

The previous prime is 661163839613. The next prime is 661163839667. The reversal of 661163839637 is 736938361166.

It is a happy number.

661163839637 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 661163839637 - 2¹⁰ = 661163838613 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (661163839667) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2485578212 + ... + 2485578477.

It is an arithmetic number, because the mean of its divisors is an integer number (99423133800).

Almost surely, 2^661163839637 is an apocalyptic number.

It is an amenable number.

661163839637 is a deficient number, since it is larger than the sum of its proper divisors (134221230763).

661163839637 is a wasteful number, since it uses less digits than its factorization.

661163839637 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4971156715.

The product of its digits is 17635968, while the sum is 59.

The spelling of 661163839637 in words is "six hundred sixty-one billion, one hundred sixty-three million, eight hundred thirty-nine thousand, six hundred thirty-seven".