61398040772 has 24 divisors (see below), whose sum is σ = 107596732320. Its totient is φ = 30656151680.

The previous prime is 61398040733. The next prime is 61398040793. The reversal of 61398040772 is 27704089316.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 12743708 + ... + 12748524.

It is an arithmetic number, because the mean of its divisors is an integer number (4483197180).

Almost surely, 2^61398040772 is an apocalyptic number.

It is an amenable number.

61398040772 is a deficient number, since it is larger than the sum of its proper divisors (46198691548).

61398040772 is a wasteful number, since it uses less digits than its factorization.

61398040772 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8611 (or 8609 counting only the distinct ones).

The product of its (nonzero) digits is 508032, while the sum is 47.

The spelling of 61398040772 in words is "sixty-one billion, three hundred ninety-eight million, forty thousand, seven hundred seventy-two".