61950956521 has 16 divisors (see below), whose sum is σ = 69057480960. Its totient is φ = 55230024960.

The previous prime is 61950956503. The next prime is 61950956563. The reversal of 61950956521 is 12565905916.

61950956521 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 61950956521 - 2⁷ = 61950956393 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61950956591) 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, 4349191 + ... + 4363411.

It is an arithmetic number, because the mean of its divisors is an integer number (4316092560).

Almost surely, 2^61950956521 is an apocalyptic number.

It is an amenable number.

61950956521 is a deficient number, since it is larger than the sum of its proper divisors (7106524439).

61950956521 is a wasteful number, since it uses less digits than its factorization.

61950956521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27744.

The product of its (nonzero) digits is 729000, while the sum is 49.

The spelling of 61950956521 in words is "sixty-one billion, nine hundred fifty million, nine hundred fifty-six thousand, five hundred twenty-one".