61445280917 has 4 divisors (see below), whose sum is σ = 61448906220. Its totient is φ = 61441655616.

The previous prime is 61445280899. The next prime is 61445280977. The reversal of 61445280917 is 71908254416.

It is a happy number.

61445280917 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 37146394756 + 24298886161 = 192734^2 + 155881^2 .

It is a cyclic number.

It is not a de Polignac number, because 61445280917 - 2¹⁴ = 61445264533 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61445280977) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1787108 + ... + 1821165.

It is an arithmetic number, because the mean of its divisors is an integer number (15362226555).

Almost surely, 2^61445280917 is an apocalyptic number.

It is an amenable number.

61445280917 is a deficient number, since it is larger than the sum of its proper divisors (3625303).

61445280917 is a wasteful number, since it uses less digits than its factorization.

61445280917 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3625302.

The product of its (nonzero) digits is 483840, while the sum is 47.

The spelling of 61445280917 in words is "sixty-one billion, four hundred forty-five million, two hundred eighty thousand, nine hundred seventeen".