61221560355 has 12 divisors (see below), whose sum is σ = 106117371360. Its totient is φ = 32651498832.

The previous prime is 61221560341. The next prime is 61221560359. The reversal of 61221560355 is 55306512216.

61221560355 is a `hidden beast` number, since 61 + 2 + 2 + 1 + 560 + 35 + 5 = 666.

It is not a de Polignac number, because 61221560355 - 2⁶ = 61221560291 is a prime.

It is not an unprimeable number, because it can be changed into a prime (61221560359) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 680239515 + ... + 680239604.

It is an arithmetic number, because the mean of its divisors is an integer number (8843114280).

Almost surely, 2^61221560355 is an apocalyptic number.

61221560355 is a deficient number, since it is larger than the sum of its proper divisors (44895811005).

61221560355 is a wasteful number, since it uses less digits than its factorization.

61221560355 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1360479130 (or 1360479127 counting only the distinct ones).

The product of its (nonzero) digits is 54000, while the sum is 36.

The spelling of 61221560355 in words is "sixty-one billion, two hundred twenty-one million, five hundred sixty thousand, three hundred fifty-five".