61101666520 has 32 divisors (see below), whose sum is σ = 137514147120. Its totient is φ = 24434373760.

The previous prime is 61101666517. The next prime is 61101666529. The reversal of 61101666520 is 2566610116.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61101666529) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 37771 + ... + 351610.

Almost surely, 2^61101666520 is an apocalyptic number.

It is an amenable number.

61101666520 is an abundant number, since it is smaller than the sum of its proper divisors (76412480600).

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

61101666520 is a wasteful number, since it uses less digits than its factorization.

61101666520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 393315 (or 393311 counting only the distinct ones).

The product of its (nonzero) digits is 12960, while the sum is 34.

The spelling of 61101666520 in words is "sixty-one billion, one hundred one million, six hundred sixty-six thousand, five hundred twenty".