61642033493 has 2 divisors, whose sum is σ = 61642033494. Its totient is φ = 61642033492.

The previous prime is 61642033489. The next prime is 61642033543. The reversal of 61642033493 is 39433024616.

61642033493 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 60684873649 + 957159844 = 246343^2 + 30938^2 .

It is a cyclic number.

It is not a de Polignac number, because 61642033493 - 2² = 61642033489 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 61642033493.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61642033403) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30821016746 + 30821016747.

It is an arithmetic number, because the mean of its divisors is an integer number (30821016747).

Almost surely, 2^61642033493 is an apocalyptic number.

It is an amenable number.

61642033493 is a deficient number, since it is larger than the sum of its proper divisors (1).

61642033493 is an equidigital number, since it uses as much as digits as its factorization.

61642033493 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 279936, while the sum is 41.

The spelling of 61642033493 in words is "sixty-one billion, six hundred forty-two million, thirty-three thousand, four hundred ninety-three".