61720701006 has 16 divisors (see below), whose sum is σ = 123663027024. Its totient is φ = 20536629504.

The previous prime is 61720701001. The next prime is 61720701011. The reversal of 61720701006 is 60010702716.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (61720701001) and next prime (61720701011).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61720701001) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9230755 + ... + 9237438.

It is an arithmetic number, because the mean of its divisors is an integer number (7728939189).

Almost surely, 2^61720701006 is an apocalyptic number.

61720701006 is an abundant number, since it is smaller than the sum of its proper divisors (61942326018).

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

61720701006 is a wasteful number, since it uses less digits than its factorization.

61720701006 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18468755.

The product of its (nonzero) digits is 3528, while the sum is 30.

The spelling of 61720701006 in words is "sixty-one billion, seven hundred twenty million, seven hundred one thousand, six".