61605661355 has 12 divisors (see below), whose sum is σ = 85996474560. Its totient is φ = 42243881904.

The previous prime is 61605661331. The next prime is 61605661373. The reversal of 61605661355 is 55316650616.

It is a happy number.

It is not a de Polignac number, because 61605661355 - 2¹⁰ = 61605660331 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 125725595 + ... + 125726084.

It is an arithmetic number, because the mean of its divisors is an integer number (7166372880).

Almost surely, 2^61605661355 is an apocalyptic number.

61605661355 is a deficient number, since it is larger than the sum of its proper divisors (24390813205).

61605661355 is a wasteful number, since it uses less digits than its factorization.

61605661355 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 251451698 (or 251451691 counting only the distinct ones).

The product of its (nonzero) digits is 486000, while the sum is 44.

The spelling of 61605661355 in words is "sixty-one billion, six hundred five million, six hundred sixty-one thousand, three hundred fifty-five".