61498555650 has 288 divisors, whose sum is σ = 196484745600. Its totient is φ = 13492684800.

The previous prime is 61498555637. The next prime is 61498555663. The reversal of 61498555650 is 5655589416.

61498555650 is a `hidden beast` number, since 6 + 1 + 4 + 9 + 85 + 556 + 5 + 0 = 666.

It is an interprime number because it is at equal distance from previous prime (61498555637) and next prime (61498555663).

It is a super-2 number, since 2×61498555650² (a number of 22 digits) contains 22 as substring.

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 143 ways as a sum of consecutive naturals, for example, 16349770 + ... + 16353530.

It is an arithmetic number, because the mean of its divisors is an integer number (682238700).

Almost surely, 2^61498555650 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 61498555650, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (98242372800).

61498555650 is an abundant number, since it is smaller than the sum of its proper divisors (134986189950).

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

61498555650 is a wasteful number, since it uses less digits than its factorization.

61498555650 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3994 (or 3986 counting only the distinct ones).

The product of its (nonzero) digits is 6480000, while the sum is 54.

The spelling of 61498555650 in words is "sixty-one billion, four hundred ninety-eight million, five hundred fifty-five thousand, six hundred fifty".