61871055520 has 48 divisors (see below), whose sum is σ = 146211700320. Its totient is φ = 24741424384.

The previous prime is 61871055487. The next prime is 61871055527. The reversal of 61871055520 is 2555017816.

It is a happy number.

61871055520 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-3 number, since 3×61871055520³ (a number of 33 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Harshad number since it is a multiple of its sum of digits (40).

It is not an unprimeable number, because it can be changed into a prime (61871055527) 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, 532599 + ... + 638281.

It is an arithmetic number, because the mean of its divisors is an integer number (3046077090).

Almost surely, 2^61871055520 is an apocalyptic number.

It is an amenable number.

61871055520 is an abundant number, since it is smaller than the sum of its proper divisors (84340644800).

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

61871055520 is a wasteful number, since it uses less digits than its factorization.

61871055520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 109357 (or 109349 counting only the distinct ones).

The product of its (nonzero) digits is 84000, while the sum is 40.

The spelling of 61871055520 in words is "sixty-one billion, eight hundred seventy-one million, fifty-five thousand, five hundred twenty".