61273455940 has 12 divisors (see below), whose sum is σ = 128674257516. Its totient is φ = 24509382368.

The previous prime is 61273455937. The next prime is 61273455941. The reversal of 61273455940 is 4955437216.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 48006562816 + 13266893124 = 219104^2 + 115182^2 .

It is a super-2 number, since 2×61273455940² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (61273455941) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1531836379 + ... + 1531836418.

It is an arithmetic number, because the mean of its divisors is an integer number (10722854793).

Almost surely, 2^61273455940 is an apocalyptic number.

It is an amenable number.

61273455940 is an abundant number, since it is smaller than the sum of its proper divisors (67400801576).

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

61273455940 is a wasteful number, since it uses less digits than its factorization.

61273455940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3063672806 (or 3063672804 counting only the distinct ones).

The product of its (nonzero) digits is 907200, while the sum is 46.

The spelling of 61273455940 in words is "sixty-one billion, two hundred seventy-three million, four hundred fifty-five thousand, nine hundred forty".