161454561616 has 20 divisors (see below), whose sum is σ = 315915426324. Its totient is φ = 79928000000.

The previous prime is 161454561577. The next prime is 161454561641. The reversal of 161454561616 is 616165454161.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 127517553216 + 33937008400 = 357096^2 + 184220^2 .

It is a super-2 number, since 2×161454561616² (a number of 23 digits) contains 22 as substring.

It is an alternating number because its digits alternate between odd and even.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 49953385 + ... + 49956616.

Almost surely, 2^161454561616 is an apocalyptic number.

161454561616 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

161454561616 is a deficient number, since it is larger than the sum of its proper divisors (154460864708).

161454561616 is a wasteful number, since it uses less digits than its factorization.

161454561616 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 99910110 (or 99910104 counting only the distinct ones).

The product of its digits is 518400, while the sum is 46.

The spelling of 161454561616 in words is "one hundred sixty-one billion, four hundred fifty-four million, five hundred sixty-one thousand, six hundred sixteen".