61195252840 has 16 divisors (see below), whose sum is σ = 137689318980. Its totient is φ = 24478101120.

The previous prime is 61195252831. The next prime is 61195252843. The reversal of 61195252840 is 4825259116.

It can be written as a sum of positive squares in 2 ways, for example, as 57292252164 + 3903000676 = 239358^2 + 62474^2 .

It is not an unprimeable number, because it can be changed into a prime (61195252843) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 764940621 + ... + 764940700.

Almost surely, 2^61195252840 is an apocalyptic number.

It is an amenable number.

61195252840 is an abundant number, since it is smaller than the sum of its proper divisors (76494066140).

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

61195252840 is a wasteful number, since it uses less digits than its factorization.

61195252840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1529881332 (or 1529881328 counting only the distinct ones).

The product of its (nonzero) digits is 172800, while the sum is 43.

The spelling of 61195252840 in words is "sixty-one billion, one hundred ninety-five million, two hundred fifty-two thousand, eight hundred forty".