61712156550 has 96 divisors (see below), whose sum is σ = 171031803264. Its totient is φ = 14595616000.

The previous prime is 61712156491. The next prime is 61712156557. The reversal of 61712156550 is 5565121716.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 61712156499 and 61712156508.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61712156557) 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 47 ways as a sum of consecutive naturals, for example, 388464 + ... + 523763.

It is an arithmetic number, because the mean of its divisors is an integer number (1781581284).

Almost surely, 2^61712156550 is an apocalyptic number.

61712156550 is an abundant number, since it is smaller than the sum of its proper divisors (109319646714).

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

61712156550 is a wasteful number, since it uses less digits than its factorization.

61712156550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 912294 (or 912289 counting only the distinct ones).

The product of its (nonzero) digits is 63000, while the sum is 39.

The spelling of 61712156550 in words is "sixty-one billion, seven hundred twelve million, one hundred fifty-six thousand, five hundred fifty".