61520555345 has 8 divisors (see below), whose sum is σ = 74864450880. Its totient is φ = 48523254640.

The previous prime is 61520555303. The next prime is 61520555377. The reversal of 61520555345 is 54355502516.

61520555345 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 61520555345 - 2¹⁰ = 61520554321 is a prime.

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, 86648315 + ... + 86649024.

It is an arithmetic number, because the mean of its divisors is an integer number (9358056360).

Almost surely, 2^61520555345 is an apocalyptic number.

It is an amenable number.

61520555345 is a deficient number, since it is larger than the sum of its proper divisors (13343895535).

61520555345 is a wasteful number, since it uses less digits than its factorization.

61520555345 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 173297415.

The product of its (nonzero) digits is 450000, while the sum is 41.

The spelling of 61520555345 in words is "sixty-one billion, five hundred twenty million, five hundred fifty-five thousand, three hundred forty-five".