61271356408 has 32 divisors (see below), whose sum is σ = 124831296000. Its totient is φ = 28087037280.

The previous prime is 61271356381. The next prime is 61271356507. The reversal of 61271356408 is 80465317216.

61271356408 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Smith number, since the sum of its digits (43) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6496918 + ... + 6506341.

It is an arithmetic number, because the mean of its divisors is an integer number (3900978000).

Almost surely, 2^61271356408 is an apocalyptic number.

It is an amenable number.

61271356408 is an abundant number, since it is smaller than the sum of its proper divisors (63559939592).

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

61271356408 is a wasteful number, since it uses less digits than its factorization.

61271356408 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13003315 (or 13003311 counting only the distinct ones).

The product of its (nonzero) digits is 241920, while the sum is 43.

The spelling of 61271356408 in words is "sixty-one billion, two hundred seventy-one million, three hundred fifty-six thousand, four hundred eight".