161533176440 has 16 divisors (see below), whose sum is σ = 363449647080. Its totient is φ = 64613270560.

The previous prime is 161533176419. The next prime is 161533176443. The reversal of 161533176440 is 44671335161.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161533176443) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2019164666 + ... + 2019164745.

Almost surely, 2^161533176440 is an apocalyptic number.

161533176440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

161533176440 is an abundant number, since it is smaller than the sum of its proper divisors (201916470640).

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

161533176440 is a wasteful number, since it uses less digits than its factorization.

161533176440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4038329422 (or 4038329418 counting only the distinct ones).

The product of its (nonzero) digits is 181440, while the sum is 41.

The spelling of 161533176440 in words is "one hundred sixty-one billion, five hundred thirty-three million, one hundred seventy-six thousand, four hundred forty".