161005505610 has 64 divisors (see below), whose sum is σ = 389534624640. Its totient is φ = 42588522240.

The previous prime is 161005505561. The next prime is 161005505651. The reversal of 161005505610 is 16505500161.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4908424 + ... + 4941116.

It is an arithmetic number, because the mean of its divisors is an integer number (6086478510).

Almost surely, 2^161005505610 is an apocalyptic number.

161005505610 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

161005505610 is an abundant number, since it is smaller than the sum of its proper divisors (228529119030).

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

161005505610 is a wasteful number, since it uses less digits than its factorization.

161005505610 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34023.

The product of its (nonzero) digits is 4500, while the sum is 30.

The spelling of 161005505610 in words is "one hundred sixty-one billion, five million, five hundred five thousand, six hundred ten".