161510055005 has 16 divisors (see below), whose sum is σ = 210050130864. Its totient is φ = 118509281280.

The previous prime is 161510055001. The next prime is 161510055103. The reversal of 161510055005 is 500550015161.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 16475519449 + 145034535556 = 128357^2 + 380834^2 .

It is not a de Polignac number, because 161510055005 - 2² = 161510055001 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161510055001) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7903076 + ... + 7923485.

It is an arithmetic number, because the mean of its divisors is an integer number (13128133179).

Almost surely, 2^161510055005 is an apocalyptic number.

It is an amenable number.

161510055005 is a deficient number, since it is larger than the sum of its proper divisors (48540075859).

161510055005 is a wasteful number, since it uses less digits than its factorization.

161510055005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15826736.

The product of its (nonzero) digits is 3750, while the sum is 29.

The spelling of 161510055005 in words is "one hundred sixty-one billion, five hundred ten million, fifty-five thousand, five".