161606615516 has 12 divisors (see below), whose sum is σ = 288828845088. Its totient is φ = 79084088352.

The previous prime is 161606615473. The next prime is 161606615539. The reversal of 161606615516 is 615516606161.

It is a super-2 number, since 2×161606615516² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 429804641 + ... + 429805016.

It is an arithmetic number, because the mean of its divisors is an integer number (24069070424).

Almost surely, 2^161606615516 is an apocalyptic number.

It is an amenable number.

161606615516 is a deficient number, since it is larger than the sum of its proper divisors (127222229572).

161606615516 is a wasteful number, since it uses less digits than its factorization.

161606615516 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 859609708 (or 859609706 counting only the distinct ones).

The product of its (nonzero) digits is 194400, while the sum is 44.

The spelling of 161606615516 in words is "one hundred sixty-one billion, six hundred six million, six hundred fifteen thousand, five hundred sixteen".