161611545477 has 16 divisors (see below), whose sum is σ = 223457544000. Its totient is φ = 103771457664.

The previous prime is 161611545463. The next prime is 161611545499. The reversal of 161611545477 is 774545116161.

It is not a de Polignac number, because 161611545477 - 2⁷ = 161611545349 is a prime.

It is a super-2 number, since 2×161611545477² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161611545427) 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, 2235327 + ... + 2306492.

It is an arithmetic number, because the mean of its divisors is an integer number (13966096500).

Almost surely, 2^161611545477 is an apocalyptic number.

It is an amenable number.

161611545477 is a deficient number, since it is larger than the sum of its proper divisors (61845998523).

161611545477 is a wasteful number, since it uses less digits than its factorization.

161611545477 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4542260.

The product of its digits is 705600, while the sum is 48.

The spelling of 161611545477 in words is "one hundred sixty-one billion, six hundred eleven million, five hundred forty-five thousand, four hundred seventy-seven".