61861658075376 has 80 divisors (see below), whose sum is σ = 161250158260896. Its totient is φ = 20434693644288.

The previous prime is 61861658075291. The next prime is 61861658075383. The reversal of 61861658075376 is 67357085616816.

It is a self number, because there is not a number n which added to its sum of digits gives 61861658075376.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 32000946 + ... + 33878958.

Almost surely, 2^{61861658075376} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 61861658075376, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (80625079130448).

61861658075376 is an abundant number, since it is smaller than the sum of its proper divisors (99388500185520).

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

61861658075376 is a wasteful number, since it uses less digits than its factorization.

61861658075376 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1884210 (or 1884204 counting only the distinct ones).

The product of its (nonzero) digits is 304819200, while the sum is 69.

The spelling of 61861658075376 in words is "sixty-one trillion, eight hundred sixty-one billion, six hundred fifty-eight million, seventy-five thousand, three hundred seventy-six".