61450361644 has 12 divisors (see below), whose sum is σ = 122900723344. Its totient is φ = 26335869264.

The previous prime is 61450361633. The next prime is 61450361657. The reversal of 61450361644 is 44616305416.

It is a happy number.

61450361644 is an admirable number.

It is a super-2 number, since 2×61450361644² (a number of 22 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 61450361597 and 61450361606.

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 3 ways as a sum of consecutive naturals, for example, 1097327859 + ... + 1097327914.

Almost surely, 2^61450361644 is an apocalyptic number.

It is an amenable number.

61450361644 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

61450361644 is a wasteful number, since it uses less digits than its factorization.

61450361644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2194655784 (or 2194655782 counting only the distinct ones).

The product of its (nonzero) digits is 207360, while the sum is 40.

The spelling of 61450361644 in words is "sixty-one billion, four hundred fifty million, three hundred sixty-one thousand, six hundred forty-four".