4061561036640 has 96 divisors (see below), whose sum is σ = 12875407423200. Its totient is φ = 1076184305664.

The previous prime is 4061561036591. The next prime is 4061561036641. The reversal of 4061561036640 is 466301651604.

It is a tau number, because it is divible by the number of its divisors (96).

It is a junction number, because it is equal to n+sod(n) for n = 4061561036592 and 4061561036601.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4061561036641) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 26872365 + ... + 27023084.

It is an arithmetic number, because the mean of its divisors is an integer number (134118827325).

Almost surely, 2^{4061561036640} is an apocalyptic number.

4061561036640 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

4061561036640 is an abundant number, since it is smaller than the sum of its proper divisors (8813846386560).

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

4061561036640 is a wasteful number, since it uses less digits than its factorization.

4061561036640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53895624 (or 53895616 counting only the distinct ones).

The product of its (nonzero) digits is 311040, while the sum is 42.

The spelling of 4061561036640 in words is "four trillion, sixty-one billion, five hundred sixty-one million, thirty-six thousand, six hundred forty".