61173552020 has 24 divisors (see below), whose sum is σ = 146816525184. Its totient is φ = 20973789216.

The previous prime is 61173551993. The next prime is 61173552023. The reversal of 61173552020 is 2025537116.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61173552023) 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, 218476832 + ... + 218477111.

It is an arithmetic number, because the mean of its divisors is an integer number (6117355216).

Almost surely, 2^61173552020 is an apocalyptic number.

It is an amenable number.

61173552020 is an abundant number, since it is smaller than the sum of its proper divisors (85642973164).

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

61173552020 is a wasteful number, since it uses less digits than its factorization.

61173552020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 436953959 (or 436953957 counting only the distinct ones).

The product of its (nonzero) digits is 12600, while the sum is 32.

The spelling of 61173552020 in words is "sixty-one billion, one hundred seventy-three million, five hundred fifty-two thousand, twenty".